Cheapest priced copy (Planar Chaos): $0.39 at Card Kingdom, near mint, their price list as of .
Mantle of Leadership 
Enchantment — Aura · Uncommon · Planar Chaos · #9
Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
Whenever a creature enters, enchanted creature gets +2/+2 until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.39 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Planar Chaos | 9 | Uncommon | $0.39 | $0.99 |