Theone, the Gleaming Wing

When Theone, the Gleaming Wing or an enchantment enters the battlefield, create a 0/1 butterfly token creature with flying.
Sacrifice X butterfly creatures: If X is 1 or more,
you gain 2 life. If X is 3 or more, Exile up to one
target permanent. Return it to the battlefield
under its owner's control. If X is 5 or more,
creatures you control gain hexproof and indestructible until the end of turn.