Uneth, Argent Prodigy

Hexproof
When Uneth, Argent Prodigy attacks, search your
library for a card called Tablet of Eons, reveal it,
and put it in your hand. If Tablet of Eons is in
your hand, equip it instead.
At the end of your untap phase, if equipped with Tablet of Eons, exile Uneth, Argent Prodigy, then return her to the battlefield under her owner's
control.
She toiled day after day in pursuit of perfection, unaware of what it was she truly sought