Enchantment — Aura, B (1)
Common
Enchant creature
When enchanted creature is dealt damage, destroy it.
"Is there anything in Guul Draz that doesn't suck the life out of you?"
—Tarsa, Sea Gate sell-sword
Illus. Dave Kendall

10/1/2009: Mire Blight's ability triggers when the enchanted creature is dealt any kind of damage, not just combat damage.
10/1/2009: If 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.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern