Possessed Centaur is a rare Creature — Centaur Horror card from Torment (TOR), collector number 137. Current market price: $0.32 (foil $6.96), TCGplayer market prices via Scryfall.
Trample Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1, is black, and has "{2}{B}, {T}: Destroy target green creature."