standard
future
historic
gladiator
pioneer
explorer
modern
legacy
pauper
vintage
penny
commander
brawl
alchemy
paupercommander
duel
oldschool
premodern
Rulings
Cat and Glimmer are both creature types. Enduring Curiosity won't have those creature types when its last ability returns it to the battlefield because it won't be a creature.
A token that's a copy of Enduring Curiosity won't return to the battlefield when its last ability resolves.
If a nontoken permanent that's a copy of Enduring Curiosity dies while it's a creature, it will return to the battlefield as an enchantment when its last ability resolves. It won't have any card types other than enchantment.
A token that's a copy of Enduring Curiosity won't return to the battlefield when its last ability resolves.
If a nontoken permanent that's a copy of Enduring Curiosity dies while it's a creature, it will return to the battlefield as an enchantment when its last ability resolves. It won't have any card types other than enchantment.
Rulings
Cat and Glimmer are both creature types. Enduring Curiosity won't have those creature types when its last ability returns it to the battlefield because it won't be a creature.
A token that's a copy of Enduring Curiosity won't return to the battlefield when its last ability resolves.
If a nontoken permanent that's a copy of Enduring Curiosity dies while it's a creature, it will return to the battlefield as an enchantment when its last ability resolves. It won't have any card types other than enchantment.
A token that's a copy of Enduring Curiosity won't return to the battlefield when its last ability resolves.
If a nontoken permanent that's a copy of Enduring Curiosity dies while it's a creature, it will return to the battlefield as an enchantment when its last ability resolves. It won't have any card types other than enchantment.
Your collection? Your decks?
Want to manage your collection and/or create decks?