Reviving Melody — ruling 1

You choose which mode you're using—or whether to use both modes—as you're casting the spell. Once this choice is made, it can't be changed later while the spell is on the stack.

Reviving Melody — ruling 2

If you choose both modes, and only one of the cards is still a legal target when Reviving Melody tries to resolve, only that card is returned to your hand.

Reviving Melody : règles, fonctionnement et interactions (MTG)

Reviving Melody is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Choose one or both — • Return target creature card from your graveyard to your hand. • Return target enchantment card from your graveyard to your hand.

How it works : Reviving Melody

Original English text — Wizards of the Coast / Scryfall

#1April 26, 2014· Wizards of the Coast
You choose which mode you're using—or whether to use both modes—as you're casting the spell. Once this choice is made, it can't be changed later while the spell is on the stack.
No other card is named in this ruling.
#2April 26, 2014· Wizards of the Coast
If you choose both modes, and only one of the cards is still a legal target when Reviving Melody tries to resolve, only that card is returned to your hand.
No other card is named in this ruling.