Den of the Abyss

Blue creatures you control gain +1/+1.
Fish, Kraken, Leviathan, and Merfolk creatures you control gain +1/+1 and have Waterproof (If this creature would take 2 or more damage from a blue source, reduce it by 1.)
{p/u}: Create a blue 1/1 Merfolk creature token with Islandwalk. Use this ability only as a sorcery and only up to 3 times per turn.