Tidewalker {2}{U}
Creature — Elemental
This creature enters with a time counter on it for each Island you control.
Vanishing (At the beginning of your upkeep, remove a time counter from this creature. When the last is removed, sacrifice it.)
Tidewalker's power and toughness are each equal to the number of time counters on it.
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Cards that do something similar expected a card that isn't here?
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