Cheapest priced copy (Mirage): $0.35 at Card Kingdom, near mint, their price list as of .
Agility 
Enchantment — Aura · Common · Mirage · #154
Enchant creature
Enchanted creature gets +1/+1 and has flanking. (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirage | 154 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 4 October 2004If the enchanted creature already has Flanking, its effect is cumulative.