At the beginning of combat on your turn, target creature you control with a +1/+1 counter on it gains menace until end of turn. Exhaust — {5}: Put two +1/+1 counters on this creature.
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Exhaust abilities can be activated any time you could normally activate an ability.
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If an ability triggers whenever you activate an exhaust ability, that ability resolves before the exhaust ability resolves.
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If an exhaust ability of a permanent is activated, and then that permanent leaves the battlefield and returns to the battlefield, it becomes a new object so its exhaust ability can be activated again.
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The creature you target must have a +1/+1 counter on it when the ability goes on the stack at the beginning of combat. You cannot put the counter on it in response.