
Enchantment Creature — Elk Glimmer
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.)
3/3

Gives all your creatures a mana-tap ability identically.

Grants your creatures '{T}: Add G' for mass mana.

Untaps creatures to tap them for mana, similar token ramp.

Saga that lets creatures tap for any color mana.

Single creature taps for big mana of any color.

Equipment giving a creature tap-for-any-color ability.

Elf mana dork scaling mana production from creatures.

Green creature that taps for massive mana ramp.
→ Infinite ETB, Infinite colored mana, Infinite creature tokens with haste
→ Infinite colored mana, Infinite combat phases, Infinite untap of creatures you control
→ Infinite colored mana
→ Infinite colored mana, Put most creature cards from your library onto the battlefield
→ Infinite colored mana
→ Near-infinite +1/+1 counters on a creature, Near-infinite combat phases, Near-infinite damage to all players
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.
A token that's a copy of Enduring Vitality won't return to the battlefield when its last ability resolves.
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.