The Narrows

At the beginning of your upkeep, remove a chase counter from The Narrows. Then, if there are no chase counters on The Narrows, return all creature cards exiled by The Narrows to the battlefield under their owner's control.
{1}, {t}: Exile target creature you control. Put a number of chase counters on The Narrows equal to the exiled creature's power. Activate this ability only if there are no chase counters on The Narrows.