Namor the Sub-Mariner is a mythic Legendary Creature — Mutant Merfolk Villain card from Marvel Super Heroes (MSH), collector number 362. Current market price: $5.25 (foil $8.81), TCGplayer market prices via Scryfall.
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.