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: Whenever target creature deals combat damage to a non-Wall creature this turn, destroy that non-Wall creature. When the targeted creature leaves the battlefield this turn, sacrifice this artifact. Activate only before blockers are declared.
Acidic Dagger does not affect the creature if all damage is prevented or redirected.
If a turn has multiple combat phases, the ability can only be activated before the beginning of the Declare Blockers Step of the first combat phase in that turn.