Centaur Chieftain is a uncommon Creature — Centaur card from Torment (TOR), collector number 122. Current market price: $0.21 (foil $0.31), TCGplayer market prices via Scryfall.
Haste Threshold — As long as there are seven or more cards in your graveyard, this creature has "When this creature enters, creatures you control get +1/+1 and gain trample until end of turn."