Medomai the Ageless + Idris, Soul of the TARDIS + Thrummingbird + Thran Forge

Prerequisites

• An opponent cannot block creatures you control.

Steps

1. 1Activate Thran Forge by paying , causing Medomai the Ageless to become an artifact until end of turn and get +1/+0 until end of turn.
2. 2Deal combat damage to an opponent using Medomai the Ageless.
3. 3Medomai the Ageless triggers, causing you to take an extra turn after this one.
4. 4Cast Idris by paying .
5. 5When Idris enters the battlefield, it triggers, exiling Medomai the Ageless until Idris leaves the battlefield.
6. 6Move to your extra turn.
7. 7At the beginning of your upkeep, Idris's vanishing ability triggers, removing a time counter from it.
8. 8Deal combat damage to an opponent using Idris and Thrummingbird.
9. 9Idris and Thrummingbird trigger.
10. 10Resolve the Idris trigger, causing you to take an extra turn after this one.
11. 11Resolve the Thrummingbird trigger, putting a time counter on Idris.
12. 12Repeat from step 6.

Effects

• Infinite turns
• Lock