Circle of Elders is a uncommon Creature — Human Shaman card from Dragons of Tarkir (DTK), collector number 176. Current market price: $0.10 (foil $0.69), TCGplayer market prices via Scryfall.
Vigilance Formidable — {T}: Add {C}{C}{C}. Activate only if creatures you control have total power 8 or greater.