Does Immortal Phoenix's effect work in the graveyard to revive when you play Cull the Weak and kill your own unit?

Ruling: Yes, if you play Cull the Weak and kill one of your own units, Immortal Phoenix can return from the graveyard.

Nuances:

• Phoenix's effect does not require an enemy unit to be killed, so killing your own unit with Cull the Weak triggers the revival effect.