Invasion of Segovia // Caetus, Sea Tyrant of Segovia is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.) When this Siege enters, create two 1/1 blue Kraken creature tokens with trample. Noncreature spells you cast have convoke. (Your creatures can help cast those spells. Each creature you tap while casting a noncreature spell pays foror one mana of that creature's color.) At the beginning of your end step, untap up to four target creatures.
Complete guide
Invasion of Segovia // Caetus, Sea Tyrant of Segovia brings the flavor of a tiny world with a massive impact to your Magic: The Gathering matches. This unique Siege battle provides an immediate board presence and transforms into a powerful engine that fuels your noncreature spells through the convoke mechanic. Whether you are looking to swarm the field or cast expensive spells with ease, this card offers incredible utility in any blue deck.
Invading the Battlefield
When Invasion of Segovia enters the battlefield, you choose an opponent to protect it. It arrives with 4 defense counters. Immediately, its triggered ability puts two 1/1 blue Kraken creature tokens with trample onto the field. To flip this card, you or other players must deal 4 damage to it. Once the last counter is removed, the Siege is exiled and you cast the back face, Caetus, Sea Tyrant of Segovia, for free.
Mastering Convoke and Untapping
Once transformed, Caetus grants all your noncreature spells convoke. This allows you to tap your creatures to pay for generic or colored mana of those spells. Remember that convoke is applied after total costs (including additions like Commander tax) are calculated. Furthermore, Caetus has an end step trigger that untaps up to four target creatures, effectively resetting your 'mana' for your opponents' turns or allowing you to attack and still have blockers or convoke fodder ready.
Common Mistakes
A common error involves timing: if you tap a creature for a mana ability (like a Llanowar Elves) while casting a spell, you cannot tap that same creature for convoke, as it is already tapped. Also, note that as the controller of the Siege, you cannot block for it; only the chosen protector can assign blockers to stop your attackers. Finally, if the Siege is destroyed by an effect that doesn't remove defense counters (like a 'destroy target permanent' spell), it goes to the graveyard and does not transform.
When to Play It
Invasion of Segovia is best utilized in decks with high creature counts that want to transition into powerful noncreature spells like Sorceries or Artifacts. It is particularly effective when you have creatures that were just played; since convoke doesn't use the tap symbol, creatures with 'summoning sickness' can still be tapped to pay for spells. The end step untap ability also makes it a defensive powerhouse, ensuring you are never left vulnerable after a big play.
Interaction examples
Solemn SimulacrumWith Caetus, Sea Tyrant of Segovia on the battlefield, you can use your creatures to cast noncreature spells. If you want to cast a noncreature artifact like Solemn Simulacrum (which is a creature spell and thus does NOT get convoke from Caetus), you must pay mana normally. However, once Solemn Simulacrum is on the battlefield, you can tap it to help convoke a later noncreature spell, and then Caetus will untap it during your end step so it is ready to block.
Roaming ThroneIf you have Roaming Throne on the battlefield with 'Serpent' chosen as the creature type, and you transform Invasion of Segovia into Caetus, Sea Tyrant of Segovia, the end step ability of Caetus will trigger twice. This allows you to untap up to eight creatures instead of four, providing massive defensive utility or preparation for casting spells on your opponent's turn using convoke.
KrakenWhen Invasion of Segovia enters the battlefield, you create two 1/1 blue Kraken creature tokens. These tokens are key to the card's strategy: you can use them to attack the Siege itself to remove defense counters. Once the Siege transforms into Caetus, these same Kraken tokens can be tapped via convoke to pay for blue mana or generic mana for your noncreature spells.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Invasion of Segovia // Caetus, Sea Tyrant of Segovia
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
You can tap any untapped creature you control to convoke a spell, even one you haven't controlled continuously since the beginning of your most recent turn.
No other card is named in this ruling.
- #2· Wizards of the Coast
Tapping an untapped creature that's attacking or blocking to convoke a spell won't cause that creature to stop attacking or blocking.
No other card is named in this ruling.
- #3· Wizards of the Coast
When calculating a spell's total cost, include any alternative costs, additional costs, or anything else that increases or reduces the cost to cast the spell. Convoke applies after the total cost is calculated. Convoke doesn't change a spell's mana cost or mana value.
No other card is named in this ruling.
- #4· Wizards of the Coast
If a creature you control has a mana ability with
in the cost, activating that ability while casting a spell with convoke will result in the creature being tapped before you pay the spell's costs. You won't be able to tap it again for convoke. Similarly, if you sacrifice a creature to activate a mana ability while casting a spell with convoke, that creature won't be on the battlefield when you pay the spell's costs, so you won't be able to tap it for convoke.No other card is named in this ruling.
- #5· Wizards of the Coast
Because convoke isn't an alternative cost, it can be used in conjunction with alternative costs.
No other card is named in this ruling.
- #6· Wizards of the Coast
Tapping a multicolored creature using convoke will pay for
or one mana of your choice of any of that creature's colors.No other card is named in this ruling.
- #7· Wizards of the Coast
Only creatures controlled by a battle's protector can block creatures that are attacking that battle. This means a Siege's controller can never assign creatures to block for it.
No other card is named in this ruling.
- #8· Wizards of the Coast
A battle can be dealt damage and be target of spells and/or abilities that target "any target."
No other card is named in this ruling.
- #9· Wizards of the Coast
Damage dealt to a battle causes that many defense counters to be removed from it.
No other card is named in this ruling.
- #10· Wizards of the Coast
A battle can be attacked by all players other than its protector. Notably, this means a Siege's controller can attack it.
No other card is named in this ruling.
- #11· Wizards of the Coast
If a battle has no defense counters, and it isn't the source of a triggered ability that has triggered but not yet left the stack, that battle is put into its owner's graveyard. This is a state-based action. This doesn't cause a Siege's intrinsic triggered ability to trigger.
No other card is named in this ruling.
- #12· Wizards of the Coast
If you sacrifice Caetus while casting a noncreature spell (say, to activate a mana ability), the spell won't have convoke when you pay its costs unless it has convoke some other way.
No other card is named in this ruling.
- #13· Wizards of the Coast
If a token or a card that isn't represented by a transforming double-faced card becomes a copy of a Siege, it can't be cast as its triggered ability resolves. It will remain in exile. If it's a token, it will cease to exist the next time state-based actions are performed.
No other card is named in this ruling.
- #14· Wizards of the Coast
If a permanent that is represented by a transforming double-faced card becomes a copy of a Siege, it will be exiled as that Siege's triggered ability resolves, then it will be cast transformed. Note that this applies only to transforming double-faced cards, not to modal double-faced cards that can normally be played using either face.
No other card is named in this ruling.
- #15· Wizards of the Coast
In a multiplayer game, if the protector of a battle leaves the game and that battle is not currently being attacked, its controller chooses a new protector for it as a state-based action. If it is being attacked, its controller chooses a new protector for it once no creatures are attacking it. This means that it continues to be attacked and can be dealt combat damage as normal.
No other card is named in this ruling.
- #16· Wizards of the Coast
If a battle that's being attacked somehow stops being a battle, it is removed from combat. Similarly, if its controller changes in the middle of combat, it is removed from combat.
No other card is named in this ruling.
- #17· Wizards of the Coast
Battles can't attack or block, even if one also becomes a creature. If an attacking or blocking creature somehow becomes a battle in addition to being a creature, it is removed from combat.
No other card is named in this ruling.
- #18· Wizards of the Coast
If a Siege never had defense counters on it (perhaps because a permanent became a copy of one), it can't have its last defense counter removed. It will be put into its owner's graveyard. You won't exile it or cast the other face.
No other card is named in this ruling.
- #19· Wizards of the Coast
Sieges each have an intrinsic triggered ability. That ability is "When the last defense counter is removed from this permanent, exile it, then you may cast it transformed without paying its mana cost."
No other card is named in this ruling.
- #20· Wizards of the Coast
As a Siege enters the battlefield, its controller chooses an opponent to be its protector.
No other card is named in this ruling.
- #21· Wizards of the Coast
A Siege's controller can't be its protector. If a Siege's protector ever gains control of it, they choose a new player to be its protector. This is a state-based action.
No other card is named in this ruling.
- #22· Wizards of the Coast
If a non-battle permanent that is already on the battlefield become a copy of a Siege, its controller chooses one of their opponents to be that battle's protector. However, it will most likely be put into its owner's graveyard because it has no defense counters (see below).
No other card is named in this ruling.
- #23· Wizards of the Coast
A battle's "defense" is displayed in the bottom right corner of the card. A battle enters the battlefield with that number of defense counters. If another permanent enters the battlefield as a copy of a battle, it also enters with that number of defense counters.
No other card is named in this ruling.
Popular combos
Real combos played by the community, sorted by popularity.
Jeskai Ascendancy + Invasion of Segovia // Caetus, Sea Tyrant of Segovia
- 1Cast the buyback spell with buyback by tapping any number of creatures.
- 2Jeskai Ascendancy's first and second abilities trigger.
- 3Resolve the first trigger, giving creatures you control +1/+1 until end of turn and untapping them.
- 4Resolve the second trigger, allowing you to loot.
- 5Resolve the spell with buyback, returning it to your hand.
- 6Repeat.
Archaeomancer + Invasion of Segovia // Caetus, Sea Tyrant of Segovia + Essence Flux
- 1Cast Essence Flux by tapping Archaeomancer due to Essence Flux's convoke ability, blinking Archaeomancer.
- 2When Archaeomancer enters, it triggers, returning Essence Flux from your graveyard to your hand.
- 3Repeat.
Stormsplitter + Invasion of Segovia // Caetus, Sea Tyrant of Segovia + Haze of Rage
- 1Cast Haze of Rage with buyback by paying
, tapping Stormsplitter, and tapping Caetus. - 2Haze of Rage's Storm ability and each Stormsplitter triggers.
- 3Resolve Haze of Rage's Storm ability, creating a copy of it for each spell cast before it this turn and resolving all those copies.
- 4Resolve each Stormsplitter's trigger, creating a token copy of each one.
- 5Haze of Rage resolves, giving creatures you control +1/+0 until end of turn and returning itself to your hand.
- 6Cast Haze of Rage with buyback by paying
and tapping one token copy of Stormsplitter. - 7Repeat steps 2 through 5.
- 8Cast Haze of Rage with buyback by paying and tapping two token copies of Stormsplitter.
Archaeomancer + Invasion of Segovia // Caetus, Sea Tyrant of Segovia + Splash Portal
- 1Cast Splash Portal by tapping Archaeomancer due to Splash Portal's convoke ability, blinking Archaeomancer.
- 2When Archaeomancer enters, it triggers, returning Splash Portal from your graveyard to your hand.
- 3Repeat.
Stormsplitter + Invasion of Segovia // Caetus, Sea Tyrant of Segovia + Reiterate
- 1Cast any instant or sorcery by paying its mana cost.
- 2Stormsplitter triggers, creating a token copy of Stormsplitter.
- 3Cast Reiterate with buyback by paying , tapping two copies of Stormsplitter, and tapping Caetus.
- 4Both Stormsplitters triggers, creating two token copies of themselves.
- 5Reiterate resolves, copying the spell from step 1 and returning itself to your hand.
- 6Cast Reiterate with buyback by paying
and tapping two token copies of Stormsplitter. - 7Each Stormsplitter you control triggers, creating four token copies of Stormsplitter.
- 8Reiterate resolves, copying the spell from step 1 and returning itself to your hand.
Displacer Kitten + Skycoach Conductor // All Aboard + Invasion of Segovia // Caetus, Sea Tyrant of Segovia
- 1Cast All Aboard using the convoke ability from Invasion of Segovia // Caetus, Sea Tyrant of Segovia by tapping Skycoach Conductor.
- 2Displacer Kitten triggers, blinking Skycoach Conductor, which enters prepared.
- 3Resolve All Aboard.
- 4Repeat.
Archaeomancer + Invasion of Segovia // Caetus, Sea Tyrant of Segovia + Skycoach Conductor // All Aboard
- 1Cast Skycoach Conductor // All Aboard by tapping Archaeomancer due to Skycoach Conductor // All Aboard's convoke ability, blinking Archaeomancer.
- 2When Archaeomancer enters, it triggers, returning Skycoach Conductor // All Aboard from your graveyard to your hand.
- 3Repeat.
Invasion of Segovia // Caetus, Sea Tyrant of Segovia + Intruder Alarm + Recruit the Worthy
- 1Cast Recruit the Worthy with buyback by tapping four creatures you control, one of which must be white.
- 2Resolve Recruit the Worthy, creating a 1/1 Soldier creature token and returning Recruit the Worthy to your hand.
- 3When the Soldier enters the battlefield, Intruder Alarm triggers, untapping all creatures.
- 4Repeat.
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