Tenured Inkcaster is a uncommon Creature — Vampire Warlock card from Outlaws of Thunder Junction Commander (OTC), collector number 149. Current market price: $0.25, TCGplayer market prices via Scryfall.
When this creature enters, put a +1/+1 counter on target creature. Whenever a creature you control with a +1/+1 counter on it attacks, each opponent loses 1 life and you gain 1 life.