At the beginning of combat on your turn, if you both own and control Graf Rats and a creature named Midnight Scavengers, exile them, then meld them into Chittering Host.
Creature — Eldrazi Horror
Haste (This creature can attack, and as soon as it comes under your control.)Menace (This creature can't be blocked except by two or more creatures.)
When Chittering Host enters the battlefield, other creatures you control get +1/+0 and gain menace (This creature can't be blocked except by two or more creatures.) until end of turn.
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