Abdel Adrian enters the battlefield, exiling Mirror Image until Abdel Adrian leaves the battlefield, and creating a 1/1 Soldier creature token.
Mirror Image leaves the battlefield, triggering its second ability, returning Wormfang Drake from exile to the battlefield.
Wormfang Drake enters the battlefield, triggering its first ability, exiling Abdel Adrian.
Abdel Adrian leaves the battlefield, returning Mirror Image from exile to the battlefield as a copy of Wormfang Drake.
Mirror Image enters the battlefield, triggering its first ability, exiling Wormfang Drake.
Wormfang Drake leaves the battlefield, triggering its second ability, returning Abdel Adrian from exile to the battlefield.
Repeat from step 2.
This brilliant loop turns an endless cycle of exiling and re-entering into a self-sustaining engine. It all begins when Abdel Adrian, Gorion's Ward hits the battlefield and swallows up Mirror Image, which allows Wormfang Drake to cycle back into play and promptly exile Abdel in return. As Abdel leaves, Mirror Image returns as a fresh copy of Wormfang Drake, creating an infinite relay race where entering and leaving the battlefield continually triggers each permanent's respective abilities.