Volcanic Rush — ruling 1

An “attacking creature” is one that has been declared as an attacker that 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 the battlefield.

Volcanic Rush — ruling 2

Even though Volcanic Rush affects only attacking creatures, the bonus will remain for the rest of the turn.

Volcanic Rush — ruling 3

Only creatures that are attacking as Volcanic Rush resolves will receive the bonus. In other words, casting it before you declare attackers usually won’t do anything.

Volcanic Rush : règles, fonctionnement et interactions (MTG)

Volcanic Rush 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

Attacking creatures get +2/+0 and gain trample until end of turn.

How it works : Volcanic Rush

Original English text — Wizards of the Coast / Scryfall

#1February 25, 2015· Wizards of the Coast
An “attacking creature” is one that has been declared as an attacker that 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 the battlefield.
No other card is named in this ruling.
#2February 25, 2015· Wizards of the Coast
Even though Volcanic Rush affects only attacking creatures, the bonus will remain for the rest of the turn.
No other card is named in this ruling.
#3February 25, 2015· Wizards of the Coast
Only creatures that are attacking as Volcanic Rush resolves will receive the bonus. In other words, casting it before you declare attackers usually won’t do anything.
No other card is named in this ruling.