Biomancer's Familiar (PRNA 158s)

Creature — Mutant • Mana cost: {G}{U} • Ravnica Allegiance Promos • Rare

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.

Illustrated by Izzy.