Gore Vassal is a uncommon Creature — Phyrexian Dog card from Mirrodin Besieged (MBS), collector number 7. Current market price: $0.10 (foil $0.20), TCGplayer market prices via Scryfall.
Sacrifice this creature: Put a -1/-1 counter on target creature. Then if that creature's toughness is 1 or greater, regenerate it.