Sasha, Loyal Steed

Partner with Sofiya, Bane of Darkness, Soulbond
(You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)
As long as Sasha, Loyal Steed is paired with
another creature, both creatures have flying and horsemanship.
"If someone asks to ride you, just say neigh."
—Sofiya, hero of Ravenloft