Lurking Arynx is a uncommon Creature — Cat Beast card from Dragons of Tarkir (DTK), collector number 192. Current market price: $0.15 (foil $0.50), TCGplayer market prices via Scryfall.
Formidable — {2}{G}: Target creature blocks this creature this turn if able. Activate only if creatures you control have total power 8 or greater.