Namor the Sub-Mariner (#69)

Type: Legendary Creature — Mutant Merfolk Villain

Text: Flying
Namor's power is equal to the number of Merfolk you control.
Whenever you cast a noncreature spell with one or more blue mana symbols in its mana cost, create that many 1/1 blue Merfolk creature tokens.

Set: Marvel Super Heroes (#69)