Cheapest priced copy (Eldritch Moon): $0.35 at Card Kingdom, near mint, their price list as of .
Graf Rats 
Creature — Rat · 2/1 · Uncommon · Innistrad Remastered · #113
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.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eldritch Moon | 91 | Common | $0.35 | $0.49 |
| Innistrad Remastered | 113 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 13 July 2016For more information on meld cards, see the Eldritch Moon mechanics article (https://magic.wizards.com/en/articles/archive/feature/eldritch-moon-mechanics-2016-06-27).
- 13 July 2016The set of creatures affected by Chittering Host’s triggered ability is determined as the ability resolves. Creatures you begin to control later in the turn won’t get +1/+0 or gain menace.