Novablast Wurm — ruling 1

Novablast Wurm’s ability triggers and resolves during the declare attackers step, before blockers can be declared.

Novablast Wurm — ruling 2

Novablast Wurm’s ability destroys all players’ creatures (except Novablast Wurm), including yours.

Novablast Wurm — ruling 3

If two Novablast Wurms attack, they’ll destroy each other. This happens before they can deal combat damage.

Novablast Wurm : règles, fonctionnement et interactions (MTG)

Novablast Wurm 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

Whenever this creature attacks, destroy all other creatures.

How it works : Novablast Wurm

Original English text — Wizards of the Coast / Scryfall

#1March 1, 2010· Wizards of the Coast
Novablast Wurm’s ability triggers and resolves during the declare attackers step, before blockers can be declared.
No other card is named in this ruling.
#2March 1, 2010· Wizards of the Coast
Novablast Wurm’s ability destroys all players’ creatures (except Novablast Wurm), including yours.
No other card is named in this ruling.
#3March 1, 2010· Wizards of the Coast
If two Novablast Wurms attack, they’ll destroy each other. This happens before they can deal combat damage.
No other card is named in this ruling.