Karlov's Crossbow

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.)

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oo2qbhlpppb1hzwhav5na.