Homarid

Oracle text

This creature enters with a tide counter on it. At the beginning of your upkeep, put a tide counter on this creature. As long as there is exactly one tide counter on this creature, it gets -1/-1. As long as there are exactly three tide counters on this creature, it gets +1/+1. Whenever there are four or more tide counters on this creature, remove all tide counters from it.