Biomancer's Familiar is a rare Creature — Mutant card from Ravnica Allegiance (RNA), collector number 158. Current market price: $1.90 (foil $19.14), TCGplayer market prices via Scryfall.
Activated abilities of creatures you control cost {2} less to activate. This effect can't reduce the mana in that cost to less than one mana. {T}: The next time target creature adapts this turn, it adapts as though it had no +1/+1 counters on it.