Infantry Veteran — ruling 1

An “attacking creature” is one that has been declared as an attacker this combat, or one that was put onto the battlefield attacking this combat. Unless that creature leaves combat, it continues to be an attacking creature through the end of combat step, even if the player it was attacking has left the game, or the planeswalker it was attacking has left combat.

Infantry Veteran : règles, fonctionnement et interactions (MTG)

Infantry Veteran 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

: Target attacking creature gets +1/+1 until end of turn.

How it works : Infantry Veteran

Original English text — Wizards of the Coast / Scryfall

#1August 15, 2010· Wizards of the Coast
An “attacking creature” is one that has been declared as an attacker this combat, or one that was put onto the battlefield attacking this combat. Unless that creature leaves combat, it continues to be an attacking creature through the end of combat step, even if the player it was attacking has left the game, or the planeswalker it was attacking has left combat.
No other card is named in this ruling.