Is a unit that attacked Targon's Peak with Assault still considered an attacker while the Targon's Peak trigger is on the chain?

Ruling: Yes, a unit that attacked Targon's Peak with Assault is still considered an attacker while the Targon's Peak trigger is on the chain. Combat lasts through conquer.

Sequence:

• The unit attacks and conquers Targon's Peak
• Targon's Peak triggers when conquered and goes on the chain
• The unit is still considered an attacker during this time
• The trigger adds a game effect at the end of the turn that doesn't enter the chain

Nuances:

• You can Gust a Phoenix attacking and conquering Targon's Peak on the enemy turn if the battlefield was previously open
• If it was a combat, the Phoenix won't be gustable while the opponent has a chance to react
• Targon's Peak is different than Annie Legend ability - it triggers during conquer/combat, not at end of turn