Cheapest priced copy (Eldritch Moon): $0.49 at Card Kingdom, near mint, their price list as of .
Assembled Alphas 
Creature — Wolf · 5/5 · Rare · Eldritch Moon · #117
Whenever this creature blocks or becomes blocked by a creature, this creature deals 3 damage to that creature and 3 damage to that creature's controller.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eldritch Moon | 117 | Rare | $0.49 | $0.49 |
| Eldritch Moon Promos | 117 | Rare | — | $0.49 |
| Eldritch Moon Promos | 117s | Rare | — | $1.99 |
2 rulings from Wizards of the Coast
- 13 July 2016The triggered ability deals damage to the creature’s controller even if the creature isn’t dealt damage, perhaps because it has left the battlefield or because the damage was prevented.
- 13 July 2016The triggered ability triggers once for each creature blocking or blocked by Assembled Alphas. The ability resolves and deals damage to that creature before combat damage is dealt. If that damage destroys all creatures blocking Assembled Alphas, Assembled Alphas doesn’t become unblocked.