Urath, of the Green Water

Islandwalk
When Urath, of the Green Water enters the battlefield put two +1/+1 counters on each other elemental, merfolk and land creature you control.
Landfall - Whenever a land enters the battlefield
under your control, create a */* green and blue
merfolk creature token with islandwalk and "this creatures power and toughness are each equal to
the number of merfolk you control"