Mire Blight — ruling 1

Mire Blight’s ability triggers when the enchanted creature is dealt any kind of damage, not just combat damage.

Mire Blight — ruling 2

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.

Mire Blight : règles, fonctionnement et interactions (MTG)

Mire Blight is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Enchant creature When enchanted creature is dealt damage, destroy it.

How it works : Mire Blight

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2009· Wizards of the Coast
Mire Blight’s ability triggers when the enchanted creature is dealt any kind of damage, not just combat damage.
No other card is named in this ruling.
#2October 1, 2009· Wizards of the Coast
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.
No other card is named in this ruling.