Rikala, Homarid King (-049) - Mystery Booster Commander Edition

At the beginning of your upkeep, put a tide counter on Rikala. Then if there are four or more tide counters on Rikala, remove them.

Creatures you control get +1/+0 for each tide counter on Rikala.

Whenever you tap an Island for mana, if there are three or more tide counters on Rikala, add an additional U.