When Gleaming Overseer enters the battlefield, amass 1 (Put a +1/+1 counter on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.).
Zombie tokens you control have hexproof (This permanent can't be the target of spells or abilities your opponents control.) and menace (This creature can't be blocked except by two or more creatures.).
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