Enduring Vitality
Enchantment Creature — Elk Glimmer
Vigilance
Creatures you control have "
: Add one mana of any color."
When Enduring Vitality dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment. (It's not a creature.)
Issei Murakami
Rulings
Elk and Glimmer are both creature types. Enduring Vitality won't have those creature types when its last ability returns it to the battlefield because it won't be a creature.
(wotc • 2024-09-20)
A token that's a copy of Enduring Vitality won't return to the battlefield when its last ability resolves.
(wotc • 2024-09-20)
If a nontoken permanent that's a copy of Enduring Vitality 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.
(wotc • 2024-09-20)
Rulings
Elk and Glimmer are both creature types. Enduring Vitality won't have those creature types when its last ability returns it to the battlefield because it won't be a creature.
(wotc • 2024-09-20)
A token that's a copy of Enduring Vitality won't return to the battlefield when its last ability resolves.
(wotc • 2024-09-20)
If a nontoken permanent that's a copy of Enduring Vitality 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.
(wotc • 2024-09-20)