Cloak of Confusion

Enchant Creature    (CMC:2)

Enchant creature you control Whenever enchanted creature attacks and isn't blocked, you may have it assign no combat damage this turn. If you do, defending player discards a card at random.

82 ME2 • ENMargaret Organ-Kean

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Oracle Text (click to copy):

Cloak of Confusion {1}{B} Enchantment — Aura Enchant creature you control Whenever enchanted creature attacks and isn't blocked, you may have it assign no combat damage this turn. If you do, defending player discards a card at random.

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4/15/2013
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.

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