Grandmother Goby (9)

Mana cost
Mana value	4.0
Type	Legendary Creature — Merfolk Wizard
Rarity	rare
Colors	U
Power / Toughness	2 / 2
EDHREC rank	26653

Whenever you cast a noncreature spell, counter that spell. Create a number of 1/1 blue Merfolk creature tokens equal to the amount of mana spent to cast that spell.

She wraps the fry nursery in nullwater so the ruckus of wayward mages doesn't bother the little ones.