Baron Von Count

Baron Von Count enters with a doom counter on "5." Whenever you cast a spell with the indicated numeral in its mana cost, text box, power, or toughness, move the doom counter one numeral to the left. When the doom counter moves from "1," destroy target player and put that doom counter on "5."

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o51fj2kavpb1hge09ndjr.