Grenzo, Havoc Raiser 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
Whenever a creature you control deals combat damage to a player, choose one — • Goad target creature that player controls. • Exile the top card of that player's library. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell.
Complete guide
Grenzo, Havoc Raiser is a legendary Goblin Rogue that turns every successful combat strike into a chaotic choice for your opponents. Whether you are forcing their creatures to fight each other or stealing their best spells, Grenzo ensures the battlefield is always in a state of turmoil.
Choosing Your Havoc
Grenzo triggers whenever a creature you control deals combat damage to a player. You must choose one of two modes: Goading a creature that player controls or exiling the top card of their library to cast it yourself. Because the ability triggers per creature, landing multiple hits allows you to mix and match these effects, potentially goading an entire army or digging deep into an opponent's deck.
The Mechanics of Goad
When you goad a creature, it is forced to attack during its controller's next turn if able, and it must attack a player other than you if possible. If the creature is tapped, affected by a 'can't attack' restriction, or there are no other players to attack, it might still attack you or not attack at all. Goad doesn't grant haste, and the controller is never forced to pay mana costs to satisfy the requirement to attack.
Stealing Spells from Exile
If you choose the second mode, the card is exiled face up. You may cast it until the end of the turn using mana of any color. Note that you must still follow all timing restrictions—you cannot cast a creature or sorcery during your combat phase. Importantly, this ability specifically says 'cast,' which means if you exile a land card, you cannot play it, as lands are played rather than cast.
Strategic Timing
Grenzo is most effective in decks with high creature counts or evasive attackers. Since the second mode only lasts until the end of the turn, you usually want to trigger it during your first main phase (if you have extra combat steps) or ensure you have enough mana left in your post-combat main phase to use the stolen card before it remains in exile forever.
Interaction examples
You attack an opponent with Ornithopter of Paradise. Because it has flying, it deals 0 combat damage. Wait! Combat damage must be at least 1 for the ability to trigger. If you boost the Ornithopter's power to 1, its successful hit will trigger Grenzo, allowing you to goad a creature or exile a card. The Ornithopter can then be tapped in your second main phase to provide the mana needed to cast the stolen spell.
You attack with both Grenzo and Professional Face-Breaker. Both deal combat damage to your opponent. You get two Grenzo triggers and one Professional Face-Breaker trigger. You can use Grenzo to exile two cards from the opponent's library and use the Treasure token generated by the Face-Breaker to help pay for one of those exiled spells, even if the spell requires colors you don't normally produce.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Grenzo, Havoc Raiser
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
If a creature you control has been goaded by multiple opponents, it must attack one of your opponents that hasn't goaded it, as that fulfills the maximum number of goad requirements. If a creature you control has been goaded by each of your opponents, the creature must attack an opponent (rather than a planeswalker or battle), but you choose which opponent it attacks.
No other card is named in this ruling.
- #2· Wizards of the Coast
If, during a player's declare attackers step, a creature that player controls that's been goaded is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under that player's control continuously since the turn began (and doesn't have haste), then it doesn't attack. If there's a cost associated with having a creature attack a player, its controller isn't forced to pay that cost, so it doesn't have to attack that player.
No other card is named in this ruling.
- #3· Wizards of the Coast
If the creature doesn't meet any of the above exceptions and can attack, it must attack a player other than the controller of the spell or ability that goaded it if able. If the creature can't attack any of those players but could otherwise attack, it must attack a planeswalker an opponent controls, a battle an opponent controls, or a player who goaded it.
No other card is named in this ruling.
- #4· Wizards of the Coast
Being goaded isn't an ability the creature has. Once it's been goaded, it must attack as detailed above even if it loses all abilities.
No other card is named in this ruling.
- #5· Wizards of the Coast
Attacking with a goaded creature doesn't cause it to stop being goaded. If there is an additional combat phase that turn, or if another player gains control of it before it stops being goaded, it must attack again if able.
No other card is named in this ruling.
- #6· Wizards of the Coast
If you exile a land card this way, you can't play it.
No other card is named in this ruling.
- #7· Wizards of the Coast
Casting the exiled card follows the normal rules for casting that card. You must pay its costs, and you must follow all applicable timing rules. For example, if you exile a creature card this way, you must wait until your main phase to cast it.
No other card is named in this ruling.
- #8· Wizards of the Coast
If you don't cast the card, it will remain in exile.
No other card is named in this ruling.
- #9· Wizards of the Coast
The card exiled by the second mode is exiled face up.
No other card is named in this ruling.
Legal formats
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Ornithopter of Paradise
Professional Face-Breaker