Talise, Keeper of Zahri

Hexproof, Islandwalk
Eminence - When you cast a merfolk, put a reef
counter on one of your lands, then place +1/+1 counters, divided as you like, on merfolk creatures
you control equal to the amount of reef counters
on the battlefield.
At the end of every turn, if there are at least 5
reef counters on the battlefield, untap all merfolk
you control and put a 1/1 merfolk token with
hexproof into play.