Deeproot Waters - The Lost Caverns of Ixalan Commander - 152

Enchantment

Mana Cost: {2}{U}

Whenever you cast a Merfolk spell, create a 1/1 blue Merfolk creature token with hexproof. (A creature with hexproof can't be the target of spells or abilities your opponents control.)

Uncommon · The Lost Caverns of Ixalan Commander · #152 (LCC)

Illustrated by Zezhou Chen