Cheapest priced copy (Neon Dynasty Commander): $0.59 at Card Kingdom, near mint, their price list as of .
Unquenchable Fury 
Enchantment — Aura · Common · Battle the Horde · #10
Enchant creature
Enchanted creature has "Whenever this creature attacks, it deals X damage to defending player, where X is the number of cards in their hand."
When this Aura is put into your graveyard from the battlefield, return it to your hand.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.59 to $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Neon Dynasty Commander | 23 | Rare | $0.59 | — |
| Neon Dynasty Commander | 63 | Rare | $0.69 | — |
| Battle the Horde | 10 | Common | — | — |