Markein's Dungeon

Isolate - When Markein's Dungeon enters the battlefield, if only mana of the same color was
spent to cast it, enforce 2. (Exile target creature
with 2 arrest counters on it until it has no arrest
counters. At the beginning of its owner's upkeep,
remove an arrest counter from it.)
{3}, {t}: Enforce 2.
Whenever a creature enters the battlefield from
exile, put two -1/-1 counters on it.