Gleam of Battle — ruling 1

The +1/+1 counter is put on the creature before blockers are declared and combat damage is dealt.

Gleam of Battle — ruling 2

If a creature enters the battlefield attacking, it won’t cause Gleam of Battle to trigger.

Gleam of Battle : règles, fonctionnement et interactions (MTG)

Gleam of Battle 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 a creature you control attacks, put a +1/+1 counter on it.

How it works : Gleam of Battle

Original English text — Wizards of the Coast / Scryfall

#1April 15, 2013· Wizards of the Coast
The +1/+1 counter is put on the creature before blockers are declared and combat damage is dealt.
No other card is named in this ruling.
#2April 15, 2013· Wizards of the Coast
If a creature enters the battlefield attacking, it won’t cause Gleam of Battle to trigger.
No other card is named in this ruling.