Can you tap llanowar elves on opponent's turn?

But the reason you can't activate Llanowar Elves' ability is still because of the summoning sickness. You can usually activate their ability during your opponent's turn, though.

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Is mutate activated ability?

PSA: Mutate is apparently not an activated ability. Keeping this in consideration, what is flash in magic the gathering? Flash is a keyword ability which allows the card it is printed on to be cast at any time you could cast an Instant.

You can also ask can you bestow from the battlefield?

If a permanent with bestow enters the battlefield by any method other than being cast, it will be an enchantment creature. You can't choose to pay the bestow cost and have it become an Aura. You can also ask do enchant auras target? Here's the official ruling: 113.1b Aura spells are always targeted. These are the only permanent spells with targets. An Aura's target is specified by its enchant keyword ability (see rule 702.5, "Enchant").

Moreover, what is devotion to white?

Instant. Prevent the next X damage that would be dealt to target creature this turn, where X is your devotion to white. If damage is prevented this way, Acolyte's Reward deals that much damage to any target. ( Each. in the mana costs of permanents you control counts toward your devotion to white.) Correspondingly, are enchantment creatures still creatures? Enchantment creatures are both enchantments and creatures and therefore the rules for both apply to them.