Poseidon, God of the Seas

indestructible, islandwalk
When Poseidon, God of the Seas enters the battlefield, put X 1/1 blue Merfolk creature tokens with islandwalk onto the battlefield.
{5}{u}: Put two 1/1 blue Merfolk creature tokens with islandwalk onto the battlefield. Then, put a +1/+1 counter on all Merfolk you control.