Seafloor Stalker 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
: This creature gets +1/+0 until end of turn and can't be blocked this turn. This ability costs
less to activate for each creature in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)
Complete guide
Seafloor Stalker is a versatile Merfolk Rogue that rewards you for assembling a full adventuring party. As you recruit more allies, this creature becomes an increasingly efficient threat capable of slipping past any defense. Understanding the party mechanic is key to maximizing its potential in your blue-based decks.
What It Does
Seafloor Stalker features an activated ability that provides a power boost and makes it unblockable for the remainder of the turn. The base cost is five mana, but this price is reduced by one mana for each unique party member you control: Cleric, Rogue, Warrior, and Wizard. A full party reduces the cost to a single blue mana, while the Stalker itself counts as the Rogue for its own cost reduction.
How It Resolves Step by Step
When you choose to activate the ability, first determine the current count of your party. The game checks for the presence of each of the four types; each creature you control can fill only one slot. Once you begin the activation process and calculate the cost, players cannot respond by destroying your creatures to increase the cost. After the ability resolves, Seafloor Stalker gains +1/+0 and the 'can't be blocked' status. You can activate this multiple times in a single turn to stack the power bonus.
Common Mistakes
The most frequent error is waiting too long to activate the ability. Once a creature has legally blocked Seafloor Stalker, making it unblockable will not remove the blocker or allow the damage to go through to the player. You must activate the ability during the Declare Attackers step at the latest. Additionally, remember that while one creature can have multiple types, it only contributes +1 to the party count for a single slot.
When to Play It
Seafloor Stalker is a primary finisher in limited environments and tribal builds. It is best utilized when you have at least two other party members on board, bringing the cost down to a manageable level. Because the power buff lasts until the end of the turn, it is an excellent mana sink during your post-combat main phase if you have leftover mana and want to prepare for a larger swing on a subsequent turn.
Interaction examples
If you control only Seafloor Stalker, the game checks your party. You have one Rogue (the Stalker itself) and no Clerics, Warriors, or Wizards. The ability costs {3}{U} to activate.
Solemn SimulacrumWith both creatures on the battlefield, the game checks for party members. Seafloor Stalker is a Rogue. Solemn Simulacrum is a Golem, which is not one of the four party types. Your party count remains one, and the ability still costs {3}{U}.
Roaming ThroneIf Roaming Throne enters the battlefield and you choose 'Wizard', it becomes a Wizard Golem. When you activate Seafloor Stalker, the game sees a Rogue (Stalker) and a Wizard (Throne). Your party count is two, reducing the activation cost to {2}{U}.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Seafloor Stalker
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Once you declare that you're activating Seafloor Stalker's ability, no player can take actions to try and change the number of creatures in your party and change the activation cost.
No other card is named in this ruling.
- #2· Wizards of the Coast
Once a creature has blocked Seafloor Stalker, activating its ability won't cause it to become unblocked or remove that blocking creature from combat.
No other card is named in this ruling.
- #3· Wizards of the Coast
You can activate Seafloor Stalker's ability more than once, even if it already can't be blocked this turn.
No other card is named in this ruling.
- #4· Wizards of the Coast
To determine "the number of creatures in your party," check whether you control a Cleric, whether you control a Rogue, whether you control a Warrior, and whether you control a Wizard. The number is the total number of those checks to which you answered yes. Each creature you control can be counted for only one of those checks.
No other card is named in this ruling.
- #5· Wizards of the Coast
If a creature has more than one party creature type, and there are multiple ways to count that creature that could result in a different number of creatures in your party, the highest such number is used. For example, if you control a Cleric and a Cleric Wizard, the number of creatures in your party is two. You can't choose to have it be just one by counting the Cleric Wizard first as a Cleric.
No other card is named in this ruling.
- #6· Wizards of the Coast
An ability referring to the number of creatures in your party gets a number from zero to four. Such abilities never ask which creatures are in your party, and you never have to designate specific creatures as being in your party. You can't choose to exclude creatures from this count to lower the number.
No other card is named in this ruling.
Legal formats
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Meta decks with Seafloor Stalker
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