Dawn to Dusk — ruling 1

You choose which mode you’re using—or that you’re using 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.

Dawn to Dusk — ruling 2

Dawn to Dusk won’t affect any target that is illegal when it tries to resolve. If you chose to use both modes and both targets are illegal at that time, Dawn to Dusk won’t resolve.

Dawn to Dusk : règles, fonctionnement et interactions (MTG)

Dawn to Dusk 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 enchantment card from your graveyard to your hand. • Destroy target enchantment.

How it works : Dawn to Dusk

Original English text — Wizards of the Coast / Scryfall

#1February 1, 2014· Wizards of the Coast
You choose which mode you’re using—or that you’re using 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.
#2February 1, 2014· Wizards of the Coast
Dawn to Dusk won’t affect any target that is illegal when it tries to resolve. If you chose to use both modes and both targets are illegal at that time, Dawn to Dusk won’t resolve.
No other card is named in this ruling.