Cheapest priced copy (Commander Legends): $0.35 at Card Kingdom, near mint, their price list as of .
Dragon Mantle 
Enchantment — Aura · Common · Commander Legends · #174
Enchant creature
When this Aura enters, draw a card.
Enchanted creature has "{R}: This creature gets +1/+0 until end of turn."
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 174 | Common | $0.35 | $0.49 |
| The List | CMR-174 | Common | $0.35 | — |
| Theros | 119 | Common | $0.35 | $0.49 |
| Wilds of Eldraine: Enchanting Tales | 41 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 10 November 2020If the target creature is an illegal target by the time Dragon Mantle tries to resolve, it doesn't resolve. It won't enter the battlefield, so its enters-the-battlefield ability won't trigger.