Vadmir, New Blood is a rare Legendary Creature — Vampire Rogue card from Outlaws of Thunder Junction (OTJ), collector number 113. Current market price: $0.32 (foil $0.33), TCGplayer market prices via Scryfall.
Whenever you commit a crime, put a +1/+1 counter on Vadmir. This ability triggers only once each turn. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.) As long as Vadmir has four or more +1/+1 counters on it, it has menace and lifelink.