Eza of the Deep

Eza enters the battlefield with X +1/+1 counters
on her, where X is the number of Islands you
control.
{u}, Remove a +1/+1 counter from Eza: Create a
1/1 blue Elemental creature token with flying.
Then if this is the fourth time you've activated
this ability this turn, return all non-Elemental
creatures to their owner's hand.