Decree of Annihilation — ruling 1

When you cycle this card, first the cycling ability goes on the stack, then the triggered ability goes on the stack on top of it. The triggered ability will resolve before you draw a card from the cycling ability.

Decree of Annihilation — ruling 2

The cycling ability and the triggered ability are separate. If the triggered ability doesn't resolve (because, for example, it has been countered, or all of its targets have become illegal), the cycling ability will still resolve, and you'll draw a card.

Decree of Annihilation : règles, fonctionnement et interactions (MTG)

Decree of Annihilation 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

Exile all artifacts, creatures, and lands from the battlefield, all cards from all graveyards, and all cards from all hands. Cycling (, Discard this card: Draw a card.) When you cycle this card, destroy all lands.

How it works : Decree of Annihilation

Original English text — Wizards of the Coast / Scryfall

#1December 8, 2022· Wizards of the Coast
When you cycle this card, first the cycling ability goes on the stack, then the triggered ability goes on the stack on top of it. The triggered ability will resolve before you draw a card from the cycling ability.
No other card is named in this ruling.
#2December 8, 2022· Wizards of the Coast
The cycling ability and the triggered ability are separate. If the triggered ability doesn't resolve (because, for example, it has been countered, or all of its targets have become illegal), the cycling ability will still resolve, and you'll draw a card.
No other card is named in this ruling.