Desert Were-Worm — ruling 1

Desert Were-Worm's second ability will only trigger if creatures you attacked with had power 12 or greater at the time you attacked. Increases to the power of attacking creatures after they attack, such as from attack triggers, will not contribute to the 12 power needed for this ability to trigger.

Desert Were-Worm : règles, fonctionnement et interactions (MTG)

Desert Were-Worm 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

This creature gets +2/+0 for each Mountain you control. Whenever you attack with creatures with total power 12 or greater for the first time each turn, untap all attacking creatures. After this phase, there is an additional combat phase.

How it works : Desert Were-Worm

Original English text — Wizards of the Coast / Scryfall

#1June 29, 2026· Wizards of the Coast
Desert Were-Worm's second ability will only trigger if creatures you attacked with had power 12 or greater at the time you attacked. Increases to the power of attacking creatures after they attack, such as from attack triggers, will not contribute to the 12 power needed for this ability to trigger.
No other card is named in this ruling.