Maw of the Mire — ruling 1

If the targeted land is an illegal target by the time Maw of the Mire resolves, it won’t resolve and none of its effects will occur. You won’t gain 4 life.

Maw of the Mire : règles, fonctionnement et interactions (MTG)

Maw of the Mire 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

Destroy target land. You gain 4 life.

How it works : Maw of the Mire

Original English text — Wizards of the Coast / Scryfall

#1September 22, 2011· Wizards of the Coast
If the targeted land is an illegal target by the time Maw of the Mire resolves, it won’t resolve and none of its effects will occur. You won’t gain 4 life.
No other card is named in this ruling.