Infinite ETB, Infinite LTB, Infinite storm count
Cast Mirror Image by paying , 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 .
When Barrin enters the battlefield, its first ability triggers, returning Mirror Image from the battlefield to your hand.
Repeat.
Component Cards
How It Works
Cast Mirror Image by paying , 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 .
When Barrin enters the battlefield, its first ability triggers, returning Mirror Image from the battlefield to your hand.
Repeat.