知恵の蛇

知恵の蛇が攻撃してブロックされないたび、あなたはカードを１枚引いてもよい。そうした場合、このターン、知恵の蛇は戦闘ダメージを与えない。

Ophidian

Whenever this creature attacks and isn't blocked, you may draw a card. If you do, this creature assigns no combat damage this turn.

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Duel Decks Anthology: Jace vs. Chandra

Whenever Ophidian attacks and isn't blocked, you may draw a card. If you do, Ophidian assigns no combat damage this turn.

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—Christopher Marlowe, *Doctor Faustus*

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Duel Decks: Jace vs. Chandra

Whenever Ophidian attacks and isn't blocked, you may draw a card. If you do, Ophidian deals no combat damage this turn.

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.