Keeper of Tresserhorn 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 this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life.
Complete guide
Keeper of Tresserhorn is a imposing Avatar that offers a unique strategic trade-off on the battlefield. Instead of traditional combat damage, it utilizes an inescapable life loss ability whenever it slips past your opponent's defenses. This makes it an effective tool for chipping away at an opponent's life total regardless of their high toughness creatures.
Direct Life Loss vs. Combat Damage
The primary mechanic of Keeper of Tresserhorn is its 'attacks and isn't blocked' trigger. If your opponent chooses not to block this creature, the ability triggers during the declare blockers step. Upon resolution, two things happen: first, Keeper of Tresserhorn is prevented from assigning any combat damage for the rest of the turn. Second, the defending player loses 2 life. This loss of life is not damage, meaning it cannot be prevented by effects that stop damage.
Timing and Resolution
The ability triggers exactly when the declare blockers step begins, provided no creatures were assigned to block Keeper of Tresserhorn. If the creature is removed from the battlefield after this trigger has been put on the stack but before it resolves, the ability still functions; the defending player will still lose 2 life. Notably, because the life loss happens during the declare blockers step, the opponent loses the life before other creatures even deal their combat damage.
Strategic Considerations
One common mistake is assuming that 'isn't blocked' requires the creature to have been declared as an attacker during the declare attackers step. According to official rulings, if Keeper of Tresserhorn is put onto the battlefield already attacking and the opponent declares no blockers for it, the ability will still trigger. Additionally, remember that because it assigns no combat damage, effects like lifelink or 'whenever this creature deals damage' will not trigger if it goes unblocked.
Interaction examples
Gray Merchant of AsphodelIf you have Keeper of Tresserhorn on the battlefield and then cast Gray Merchant of Asphodel, the Avatar contributes a black pip to your devotion. When you attack with Keeper of Tresserhorn and it isn't blocked, the opponent loses 2 life. This combined pressure from the Avatar's trigger and the Merchant's enter-the-battlefield ability can quickly drain an opponent's life total through non-damage means.
Syr Konrad, the GrimWith Syr Konrad, the Grim on the battlefield, you create a dangerous situation for the blocker. If the opponent blocks Keeper of Tresserhorn and it dies in combat, Syr Konrad triggers to deal 1 damage. If they choose not to block to avoid the death trigger, Keeper of Tresserhorn's ability triggers, forcing the player to lose 2 life while assigning no damage. You effectively guarantee life loss or damage regardless of the opponent's choice.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Keeper of Tresserhorn
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
An ability that triggers when something “attacks and isn’t blocked” triggers in the declare blockers step after blockers are declared if (1) that creature is attacking and (2) no creatures are declared to block it. It will trigger even if that creature was put onto the battlefield attacking rather than having been declared as an attacker in the declare attackers step.
No other card is named in this ruling.
- #2· Wizards of the Coast
The ability triggers on declaration of blockers if the criteria is met.
No other card is named in this ruling.
Legal formats
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Meta decks with Keeper of Tresserhorn
No archived Top 8 deck with this card yet.