Atarka Beastbreaker is a common Creature — Human Warrior card from Dragons of Tarkir (DTK), collector number 174. Current market price: $0.03 (foil $0.40), TCGplayer market prices via Scryfall.
Formidable — {4}{G}: This creature gets +4/+4 until end of turn. Activate only if creatures you control have total power 8 or greater.