Aluren | Barrin, Tolarian Archmage | Mirror Image

(and one other card)

Cast
Mirror Image by paying ({0} magic symbol) , choosing to have it enter the battlefield as a copy of
Barrin.
When
Mirror Image enters the battlefield, its first ability triggers, returning
Barrin from the battlefield to your hand.
Cast
Barrin by paying ({0} magic symbol) .
When
Barrin enters the battlefield, its first ability triggers, returning
Mirror Image from the battlefield to your hand.
Repeat.