Yan, Shark King

: Whenever Yan, Shark King enters to the battkefield returned to your hand unless you control 3 or more merfolks.
0: Put a +1/+1 counter on target creature you control.
-2: Put a +1/+1 counter on target merfolk, merfolks you control with a +1/+1 counter on it can't be blocked until end of turn.