If you Hidden Blade your own Immortal Phoenix, can you summon Phoenix after Hidden Blade resolves?

Yes, you can summon Immortal Phoenix after Hidden Blade resolves.

According to the RiftJudge FAQ (ID 2182) and Rule 376.2.c.1, this interaction works because the Phoenix is moved to the trash during the resolution of the spell, and its trigger condition is evaluated immediately after the spell finishes resolving.

Sequence of Events:

1. Play Hidden Blade: You play Hidden Blade targeting your own Immortal Phoenix.
2. Hidden Blade Resolves:
   • The kill effect executes: Immortal Phoenix is moved from the battlefield to the trash (Rule 415.1).
   • You draw 2 cards.
   • Hidden Blade finishes resolving and leaves the chain.
3. Trigger Check: The game checks for triggered abilities. Since a unit was killed by a spell and Immortal Phoenix is now in the trash, its triggered ability ("When you kill a unit with a spell...") is now eligible to be put on the chain.
4. Summon Phoenix: You place the Phoenix's triggered ability on the chain. Once it resolves, you may pay the required cost ({1} Energy and {1} Fury Power) to play the Immortal Phoenix from your trash.

Relevant Rule:

Rule 376.2.c.1: "If a Game Object with a Triggered Ability that is active in a specific zone, it is evaluated and subsequently triggered if it enters that zone at the same time that its Trigger’s condition is met. Example: Immortal Phoenix... This ability triggers if Immortal Phoenix is in your trash immediately after you kill a unit with a spell, even if the unit you killed with a spell was that Immortal Phoenix."