Midnight Scavengers

When this creature enters the battlefield, you may return target creature card with mana value 3 or less from your graveyard to your hand.

(Melds with Graf Rats)

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Meld Partner: Graf Rats

When Melded, it becomes the following:

Chittering Host

Creature — Eldrazi Horror
Haste
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 until end of turn.
5/6