I use a Hidden Blade on my Immortal Phoenix which is at a battlefield. Does the same Immortal Phoenix that died to Hidden Blade trigger its ability and allow me to bring it back from the discard pile?
Yes, the Immortal Phoenix that was killed by Hidden Blade can trigger its ability to return from the trash.
According to the official FAQ (FAQ #4668, #2182, and #8545) 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.
The Sequence:
- Hidden Blade is played targeting your Immortal Phoenix.
- Hidden Blade resolves: The Phoenix is killed and moved to the trash. You draw 2 cards.
- Hidden Blade finishes resolving. The game checks for triggered abilities.
- Because the Phoenix is now in the trash and a unit was killed by a spell, its triggered ability is placed on the chain.
- You may now pay the 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."