Delif's Cone

Artifact   

: Sacrifice Delif's Cone. If target creature you control attacks and is not blocked, you may choose to gain its power in life. If you do so, it deals no damage to opponent this turn.

"Where is it written that beasts must cause pain?"Delif, Ponderings

FE • ENMark Tedin

™ & © 1993—1994 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Delif's Cone {0} Artifact {T}, Sacrifice Delif's Cone: This turn, when target creature you control attacks and isn't blocked, you may gain life equal to its power. If you do, it assigns no combat damage this turn.

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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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