Sofiya, Bane of Darkness

Partner with Sasha, Loyal Steed (When this
creature enters the battlefield, target player may put
Sasha into their hand from their library, then shuffle.)
If Sofiya, Bane of Darkness attacks and is not
blocked, you may pay {x}{b/r}. If you do, search
your library for an Aura or Equipment with mana value X or less and put it onto the battlefield
attached to Sofiya, Bane of Darkness.
"I'll rest when there's nothing wicked left."