Cheapest priced copy (Marvel Super Heroes Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Archnemesis 
Enchantment — Aura · Rare · Marvel Super Heroes Commander · #391
Enchant opponent
Whenever you attack enchanted player, that player loses 2 life. You draw a card and gain 2 life.
Whenever a player attacks you, you may attach this Aura to that player.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Marvel Super Heroes Commander | 74 | Rare | $0.49 | $1.49 |
| Marvel Super Heroes Commander | 391 | Rare | $1.99 | — |