Sigil of Myrkul (Commander Legends: Battle for Baldur's Gate 147) - Uncommon Magic: The Gathering Card

At the beginning of combat on your turn, mill a card. When you do, if there are four or more creature cards in your graveyard, put a +1/+1 counter on target creature you control and it gains deathtouch until end of turn. (To mill a card, put the top card of your library into your graveyard.)