Can Immortal Phoenix be retrieved from trash using Hextech Ray when your Might 2 creature is being attacked by a Might 5 creature, given that Phoenix requires a spell to kill a unit to trigger its return?

Ruling: No, there is no window to get the Phoenix back in this scenario. You cannot cast the spell after combat damage is dealt, and casting it before damage means the spell isn't killing the creature (combat damage would be).

Sequence:

• You can cast Hextech Ray before damage, but then the spell doesn't kill the creature (combat damage does)
• Once combat damage is applied, there is no window for Actions

Nuances:

• You could only retrieve Phoenix if your spell had Reaction and your dead unit had Deathknell, or if there are Conquest triggers
• This timing interaction is under discussion and may change in future versions