First printed in Teenage Mutant Ninja Turtles Eternal (2026)
Artifact Creature — Robot
This creature enters with two +1/+1 counters on it.
Whenever this creature attacks, double the number of +1/+1 counters on it.
When this creature dies, create a number of 1/1 colorless Robot artifact creature tokens equal to the number of +1/+1 counters on this creature.
0/0
- Illustrated by
- Miklós Ligeti
Legality
- Not legal in
- Standard, Pioneer, Modern, Pauper, Future Standard, Historic, Timeless, Alchemy, Penny Dreadful, Premodern, Old School 93/94, Pauper Commander, PreDH, Tiny Leaders, Brawl, Standard Brawl, Competitive Brawl
Rulings (2)
- To double the number of +1/+1 counters on a creature, put a number of +1/+1 counters on it equal to the number it already has. Other cards that interact with putting counters on it will interact with this effect accordingly.
- If enough -1/-1 counters are put on Big Mother Mouser at the same time to make its toughness 0 or less (or the damage marked on it to be lethal), the number of +1/+1 counters on it before it got any -1/-1 counters will be used to determine how many Robot tokens you get. For example, if there are three +1/+1 counters on Big Mother Mouser and it gets four -1/-1 counters, you'll get three Robot tokens. That's because Big Mother Mouser's last ability checks Big Mother Mouser's existence just before it leaves the battlefield, and it still has all those counters on it at that point.
Prices
MTGO price: 4.28 TIX, the cheapest non-foil print (average sell price on GoatBots, 1 Nov 2026).
Combos
22 combos, the most popular first:
- Infinite artifact ETB, Infinite artifact LTB…: Big Mother Mouser + Chrome Dome + Krark-Clan Ironworks
- Infinite creature ETB, Infinite creature LTB…: Ashnod's Altar + Big Mother Mouser + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
- Infinite creature ETB, Infinite creature LTB…: Big Mother Mouser + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Viscera Seer
- Infinite +1/+1 counters on a creature, Infinite creature ETB…: Bartolomé del Presidio + Big Mother Mouser + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
- Infinite creature ETB, Infinite creature LTB…: Big Mother Mouser + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Phyrexian Altar
- Infinite +1/+1 counters on a creature, Infinite creature ETB…: Big Mother Mouser + Carrion Feeder + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
- Infinite creature ETB, Infinite creature LTB…: Big Mother Mouser + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Umbral Collar Zealot
- Infinite creature ETB, Infinite creature LTB…: Big Mother Mouser + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Woe Strider
- Infinite creature ETB, Infinite creature LTB…: Big Mother Mouser + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Yahenni, Undying Partisan
- Infinite creature ETB, Infinite creature LTB…: Altar of Dementia + Big Mother Mouser + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
