SURGE FOILCheapest priced copy (Teenage Mutant Ninja Turtles Eternal): $1.99 at Card Kingdom, near mint, their price list as of .
Big Mother Mouser 
Artifact Creature — Robot · 0/0 · Rare · Teenage Mutant Ninja Turtles Eternal · #97
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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $1.99 to $49.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Teenage Mutant Ninja Turtles Eternal | 37 | Rare | $1.99 | $13.99 |
| Teenage Mutant Ninja Turtles Eternal | 97 | Rare | — | $49.99 |
2 rulings from Wizards of the Coast
- 27 January 2026To 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.
- 27 January 2026If 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.