Medomai the Ageless + Preeminent Captain + Artificial Evolution + Crystal Shard

Prerequisites

• Medomai and Preeminent Captain does not have summoning sickness.
• Opponents can not block and kill Preeminent Captain and Medomai.

Steps

1. 1Cast Artificial Evolution by paying , changing all instances of "Soldier" on Preeminent Captain to "Sphinx".
2. 2Declare Preeminent Captain as an attacker.
3. 3Preeminent Captain triggers, putting Medomai from your hand onto the battlefield tapped and attacking.
4. 4Deal combat damage with Medomai, causing you to take an extra turn after this one.
5. 5Activate Crystal Shard by paying and tapping it, returning Medomai to your hand.
6. 6Pass the turn.
7. 7Repeat from step 2.

Effects

• Infinite turns
• Lock