Big Mother Mouser is a rare Artifact Creature — Robot card from Teenage Mutant Ninja Turtles Eternal (TMC), collector number 37. Current market price: $1.28, TCGplayer market prices via Scryfall.
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.