Formation Breaker is a uncommon Creature — Beast card from Tarkir: Dragonstorm (TDM), collector number 143. Current market price: $0.16 (foil $0.18), TCGplayer market prices via Scryfall.
Creatures with power less than this creature's power can't block it. As long as you control a creature with a counter on it, this creature gets +1/+2.