Annya, Flicker-Mage

Flash
When Annya, Flicker-Mage enters the battlefield, exile target creature or enchantment. Return that card to the battlefield under its owner's control at the beginning of the next end step.
You may exile Annya, Flicker-Mage as it enters the battlefield and pay {u/b}{u/b}. If you do, return that card to the battlefield under your control instead, at the beginning of your next upkeep.