Karlov's Crossbow

Artifact — Equipment

Whenever equipped creature attacks, sacrifice Karlov's Crossbow and destroy target creature an opponent controls. Equip 1 Forecast — 0, Reveal Karlov's Crossbow from your hand: For the remainder of the game, spells you cast named Karlov's Crossbow cost 1 less to cast. (Activate only during your upkeep and only once each turn.)