Suffocating Fumes — ruling 1

Suffocating Fumes affects only creatures your opponents control at the time it resolves. Creatures they begin to control later in the turn won’t get -1/-1.

Suffocating Fumes : règles, fonctionnement et interactions (MTG)

Suffocating Fumes 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

Creatures your opponents control get -1/-1 until end of turn. Cycling (, Discard this card: Draw a card.)

How it works : Suffocating Fumes

Original English text — Wizards of the Coast / Scryfall

#1April 17, 2020· Wizards of the Coast
Suffocating Fumes affects only creatures your opponents control at the time it resolves. Creatures they begin to control later in the turn won’t get -1/-1.
No other card is named in this ruling.