Cheapest priced copy (Masters 25): $0.35 at Card Kingdom, near mint, their price list as of .
Lunarch Mantle 
Enchantment — Aura · Common · Eldritch Moon · #35
Enchant creature
Enchanted creature gets +2/+2 and has "{1}, Sacrifice a permanent: This creature gains flying until end of turn."
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
5 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 24 | Common | $0.35 | $0.49 |
| Eldritch Moon | 35 | Common | $0.35 | $0.49 |
| Innistrad Remastered | 31 | Common | $0.35 | $0.49 |
| Innistrad Remastered | 344 | Common | $0.35 | $0.49 |
| The List | A25-24 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 16 March 2018You can activate the ability Lunarch Mantle grants to your enchanted creature by sacrificing any permanent you control, including Lunarch Mantle or the enchanted creature itself. If you sacrifice Lunarch Mantle this way, the creature it previously enchanted still gains flying.
- 16 March 2018Only the player who controls the enchanted creature can activate the ability it gains from Lunarch Mantle. This might not be the controller of Lunarch Mantle.