Aminatou, the Aetherwisp

Flash, hexproof
When Aminatou enters the battlefield, you may
pay {x} . If you do, exile X target nonland
permanents and draw X cards. At the beginning
of the next end step, return all permanents exiled
this way to the battlefield under their owner's
control and discard that many cards.
"Such raw power and talent, at the whims of a bored
little girl." - Tymesi, master altermage