Nimona, Goddess Of Chaos

Changling, Haste, Partner.
Partners with Ballister, Disgraced Knight
When Nimona, Goddess Of Chaos
enters the battlefield or attacks, choose target
artifact. The owner of that artifact shuffles it into
their library, then reveals the top card of their
library. If it's a permanent card, they put it onto
the battlefield tapped.
"Your SideKick has Arrived!"