Annexxa, Essence Trader

Hexproof
{2}{u}{b}, {t}: Return each card exiled with
Annexxa, Essence Trader to the battlefield under
their owners' control. Then exile target creature. Annexxa, Essence Trader becomes a copy of the
exiled creature card, except it's legendary in addition to its other types, and it has this
ability.
I just need to borrow you for a bit.