Cheapest priced copy (Jumpstart 2022): $0.35 at Card Kingdom, near mint, their price list as of .
Mire Blight 
Enchantment — Aura · Common · Jumpstart 2022 · #442
Enchant creature
When enchanted creature is dealt damage, destroy it.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart 2022 | 442 | Common | $0.35 | — |
| Zendikar | 104 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 October 2009If Mire Blight’s ability triggers, the creature it was enchanting at that time is the one that will be destroyed when the ability resolves. It doesn’t matter if Mire Blight leaves the battlefield or somehow becomes attached to another creature by that time.
- 1 October 2009Mire Blight’s ability triggers when the enchanted creature is dealt any kind of damage, not just combat damage.