Aeonic Devourer

When Aeonic Devourer enters the battlefield,
each opponent sacrifices a creature or an artifact.
Put X +1/+1 counters on Aeonic Devourer,
where X is five minus the greatest converted
mana cost amongst permanents sacrificed this
way.
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The Aeonic are entropy itself - the inevitable end of
order personified in vessels of infinite hunger.