Medomai the Ageless + Idris, Soul of the TARDIS + Karn's Bastion + The Flesh Is Weak

Medomai the Ageless

Idris, Soul of the TARDIS

Karn's Bastion

The Flesh Is Weak

How it works

1. Deal combat damage to an opponent using Medomai the Ageless.
2. Medomai the Ageless triggers, causing you to take an extra turn after this one.
3. Cast Idris by paying 1.
4. When Idris enters the battlefield, it triggers, exiling Medomai the Ageless until Idris leaves the battlefield.
5. Move to your extra turn.
6. At the beginning of your upkeep, Idris's vanishing ability triggers, removing a time counter from it.
7. Activate Karn's Bastion's second ability by paying 4 and tapping it, putting a time counter on Idris.
8. Deal combat damage to an opponent using Idris.
9. Idris triggers, causing you to take an extra turn after this one.
10. Repeat from step 5.

This ingenious loop hinges on Idris, Soul of the TARDIS stealing the devastating combat trigger of Medomai the Ageless while completely bypassing Medomai's restriction against attacking during extra turns. The Flesh Is Weak makes this synergy possible by passively turning Idris into an artifact, satisfying its imprint requirement so it can exile Medomai right under the Sphinx's own nose. To ensure Idris survives the passage of time without fading away via vanishing, Karn's Bastion steps in to constantly replenish its time counters through proliferation during your upkeep. Together, these pieces establish an unbreakable engine of infinite turns and ultimate dominance.