Baron Von Count is a mythic Legendary Creature — Human Villain card from Unstable (UST), collector number 127. Current market price: $0.70 (foil $3.02), TCGplayer market prices via Scryfall.
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."