Day of Black Sun
Sorcery
Oracle Text
Each creature with mana value X or less loses all abilities until end of turn. Destroy those creatures.Rulings (1)
-
Wizards of the CoastIf 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.