Master Biomancer is a rare Creature — Elf Wizard card from Double Masters 2022 (2X2), collector number 250. Current market price: $1.72 (foil $2.65), 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.