Cheapest priced copy (Eldritch Moon): $0.35 at Card Kingdom, near mint, their price list as of .
Thraben Foulbloods 
Creature — Zombie Dog · 3/2 · Common · Eldritch Moon · #108
Delirium — This creature gets +1/+1 and has menace as long as there are four or more card types among cards in your graveyard. (A creature with menace can't be blocked except by two or more creatures.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eldritch Moon | 108 | Common | $0.35 | $0.49 |
| The List | EMN-108 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 13 July 2016Menace only matters as blockers are chosen. Causing Thraben Foulbloods to gain menace after blockers are chosen won't cause it to become unblocked.