Vincent, Vengeful Atoner is a rare Legendary Creature — Assassin card from Final Fantasy Commander (FIC), collector number 157. Current market price: $1.75 (foil $11.66), TCGplayer market prices via Scryfall.
Menace Whenever one or more creatures you control deal combat damage to a player, put a +1/+1 counter on Vincent. Chaos — Whenever Vincent deals combat damage to an opponent, it deals that much damage to each other opponent if Vincent's power is 7 or greater.