Creature — Eldrazi Horror

Meld part of Chittering Host

Innistrad Remastered

Midnight Scavengers

Eldritch Moon Checklist

Chittering Host

Creature — Rat

At the beginning of combat on your turn, if you both own and control this creature and a creature named Midnight Scavengers, exile them, then meld them into Chittering Host.

Graf Rats

Creature — Human Rogue

When this creature enters, you may return target creature card with mana value 3 or less from your graveyard to your hand.
(Melds with Graf Rats.)

Haste
Menace (This creature can't be blocked except by two or more creatures.)
When this creature enters, other creatures you control get +1/+0 and gain menace until end of turn.