Day of Black Sun — ruling 1

If a creature with an ability that triggers when that creature dies or leaves the battlefield loses that ability and is then destroyed, that ability will not trigger. Those types of triggers need to exist on the battlefield in order to work. Any abilities that trigger when a creature card is "put into the graveyard from anywhere" would still trigger, because those abilities function from the graveyard, where the card is a new object that still has the ability.

Day of Black Sun : règles, fonctionnement et interactions (MTG)

Day of Black Sun 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

Each creature with mana value X or less loses all abilities until end of turn. Destroy those creatures.

How it works : Day of Black Sun

Original English text — Wizards of the Coast / Scryfall

#1October 2, 2025· Wizards of the Coast
If a creature with an ability that triggers when that creature dies or leaves the battlefield loses that ability and is then destroyed, that ability will not trigger. Those types of triggers need to exist on the battlefield in order to work. Any abilities that trigger when a creature card is "put into the graveyard from anywhere" would still trigger, because those abilities function from the graveyard, where the card is a new object that still has the ability.
No other card is named in this ruling.