Gurzigost

At the beginning of your upkeep, sacrifice this creature unless you put two cards from your graveyard on the bottom of your library. {G}{G}, Discard a card: You may have this creature assign its combat damage this turn as though it weren't blocked.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6opxbsj39ppb1h1x4xtje6.