Delif's Cube

Artifact    (CMC:1)

, : If target creature you control attacks and is not blocked, it deals no damage to opponent. Instead, put a cube counter on Delif's Cube. : Remove a cube counter to regenerate a target creature.

FE • ENMark Tedin

™ & © 1993—1994 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Delif's Cube {1} Artifact {2}, {T}: This turn, when target creature you control attacks and isn't blocked, it assigns no combat damage this turn and you put a cube counter on Delif's Cube. {2}, Remove a cube counter from Delif's Cube: Regenerate target creature.

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View this MTG card on Gatherer

10/4/2004
If you use the ability after blockers are declared, it won't trigger at all. So you want to use it before blockers are declared.
10/4/2004
This card has an activated ability that creates a triggered ability which watches the target creature.
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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