FEM: Tidal Influence

Cast this spell only if no permanents named Tidal Influence are on the battlefield.Tidal Influence enters with a tide counter on it.At the beginning of your upkeep, put a tide counter on Tidal Influence.As long as there is exactly one tide counter on Tidal Influence, all blue creatures get -2/-0.As long as there are exactly three tide counters on Tidal Influence, all blue creatures get +2/+0.Whenever there are four or more tide counters on Tidal Influence, remove all tide counters from it.