Bloodcurdler

Flying At the beginning of your upkeep, mill a card. Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has "At the beginning of your end step, exile two cards from your graveyard."

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6onz1mhiqvpb1hkzq7exde.