Sengir, the Dark Baron is a rare Legendary Creature — Vampire Noble card from Commander Legends (CMR), collector number 722. Current market price: — (foil $0.35), TCGplayer market prices via Scryfall.
Flying Whenever another creature dies, put two +1/+1 counters on Sengir. Whenever another player loses the game, you gain life equal to that player's life total as the turn began. Partner (You can have two commanders if both have partner.)