If you discard Immortal Phoenix, does it return to your hand?

Question

Let's say I have an Immortal Phoenix in my hand, and an opponent casts a Reaper of Night (the adventure, not the creature). If I discard the Phoenix, will it return to my hand?

Answer 1

No, it won't. Dies is a term with a very specific meaning: it means to be put in the graveyard from the battlefield. If it is put there from your hand, the ability won't trigger.

700.4. The term dies means “is put into a graveyard from the battlefield.”