Stunt Double + Felidar Guardian

Prerequisites

You have enough mana to cast Stunt Double.

Steps

1. Cast Stunt Double by paying its mana cost, choosing to have it enter the battlefield as a copy of Felidar Guardian
2. When Stunt Double enters the battlefield, it triggers, blinking Felidar Guardian.
3. When Felidar Guardian enters the battlefield, it triggers, blinking Stunt Double. Choose to have Stunt Double enter the battlefield as a copy of Felidar Guardian.
4. Repeat from step 2.