When Unchecked Power kills an Immortal Phoenix on the battlefield, does the Phoenix's revival trigger occur before cleanup, allowing it to return?

Ruling: Yes, you can return your own Phoenix after Unchecked Power kills it. The Phoenix's ability checks after the spell resolves.

Sequence:

• Unchecked Power resolves and kills the Phoenix
• Phoenix's ability triggers and checks after the spell resolves
• Phoenix can return to the battlefield

Nuances:

• This works the same way as Hidden Blade killing your own Phoenix
• The Phoenix trigger is not a "when played" trigger, but rather checks after the effect resolves