Balmor, Battlemage Captain — ruling 1

Balmor's last ability affects only creatures you control at the time it resolves, including Balmor itself. Creatures you begin to control later in the turn or noncreature permanents that become creatures later won't get the bonus.

Balmor, Battlemage Captain — ruling 2

Balmor's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack without resolving.

Balmor, Battlemage Captain : règles, fonctionnement et interactions (MTG)

Balmor, Battlemage Captain 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

Flying Whenever you cast an instant or sorcery spell, creatures you control get +1/+0 and gain trample until end of turn.

How it works : Balmor, Battlemage Captain

Original English text — Wizards of the Coast / Scryfall

#1November 8, 2024· Wizards of the Coast
Balmor's last ability affects only creatures you control at the time it resolves, including Balmor itself. Creatures you begin to control later in the turn or noncreature permanents that become creatures later won't get the bonus.
No other card is named in this ruling.
#2November 8, 2024· Wizards of the Coast
Balmor's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack without resolving.
No other card is named in this ruling.