First printed in Ravnica Allegiance (2019)
Creature — Mutant
Activated abilities of creatures you control cost 
less to activate. This effect can't reduce the mana in that cost to less than one mana.
: The next time target creature adapts this turn, it adapts as though it had no +1/+1 counters on it.
2/2
Legality
- Legal in
- Pioneer, Modern, Legacy, Vintage, Historic, Timeless, Penny Dreadful, Gladiator, Commander, Duel Commander, Tiny Leaders, Oathbreaker, Brawl, Competitive Brawl
- Not legal in
- Standard, Pauper, Future Standard, Alchemy, Premodern, Old School 93/94, Pauper Commander, PreDH, Standard Brawl
Rulings (4)
- Biomancer’s Familiar affects only abilities of creatures you control on the battlefield. The costs of activated abilities of creature cards that work in other zones (such as cycling) won’t be reduced.
- Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keyword abilities are activated abilities and will have colons in their reminder text. Triggered abilities (starting with “when,” “whenever,” or “at”) are unaffected by the cost reduction ability of Biomancer’s Familiar.
- An ability that has only one generic mana and some amount of other mana symbols in its activation cost will have its cost reduced by
. - The last ability of Biomancer’s Familiar doesn’t add or remove any counters. It just lets the creature adapt despite already having +1/+1 counters on it.
Prices
MTGO price: 0.006 TIX, the cheapest non-foil print (average sell price on GoatBots, 1 Nov 2026).
Combos
314 combos, the most popular first:
- Infinite card draw for all players, Infinite draw triggers for all players…: Biomancer's Familiar + Faerie Mastermind + Smothering Tithe
- Infinite creature LTB, Infinite creature ETB…: Biomancer's Familiar + Cloud of Faeries + Emiel the Blessed
- Infinite colored mana: Biomancer's Familiar + Cryptolith Rite + Pili-Pala
- Infinite creature ETB, Infinite creature LTB: Biomancer's Familiar + Earthcraft + Emiel the Blessed
- Exile each opponent's library: Biomancer's Familiar + Knacksaw Clique + Tazri, Stalwart Survivor
- Near-infinite artifact ETB, Near-infinite artifact LTB…: Biomancer's Familiar + Smothering Tithe + Super-Skrull
- Infinite creature tokens, Infinite creature ETB: Biomancer's Familiar + Patrol Signaler + Tazri, Stalwart Survivor
- Infinite proliferate for permanents: Biomancer's Familiar + Experiment Kraj + Gilder Bairn (+ 1 other requirement)
- Infinite death triggers, Infinite creature ETB…: Biomancer's Familiar + Kenrith, the Returned King + Phyrexian Altar + Training Grounds
- Infinite card draw, Infinite colored mana…: Biomancer's Familiar + Kenrith, the Returned King + Nyxbloom Ancient + Smothering Tithe
