Dystmos, God of the Seas

Trample, Deathtouch, Cascade
Whenever you cast a spell, create a Blue 1/1 Merfolk creature token.
Tap 6 untapped Merfolk you control: Put a +1/+1 counter on each creature you control.
As long as you control 5 or fewer Merfolk, Dystmos, God of the Seas cannot attack.