Master Biomancer is a mythic Creature — Elf Wizard card from Gatecrash (GTC), collector number 176. Current market price: $1.30 (foil $5.89), TCGplayer market prices via Scryfall.
Each other creature you control enters with a number of additional +1/+1 counters on it equal to this creature's power and as a Mutant in addition to its other types.