Karlov's Crossbow (Unknown Event #CA06a)

Karlov's Crossbow {5}

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.)

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny