Cheapest priced copy (Conflux): $0.35 at Card Kingdom, near mint, their price list as of .
Elder Mastery 
Enchantment — Aura · Uncommon · Conflux · #104
Enchant creature
Enchanted creature gets +3/+3 and has flying.
Whenever enchanted creature deals damage to a player, that player discards two cards.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conflux | 104 | Uncommon | $0.35 | $0.49 |
| Duel Decks: Ajani vs. Nicol Bolas | 68 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 1 February 2009The last ability triggers from any damage dealt by the enchanted creature, not just combat damage.