Medomai the Ageless + Idris, Soul of the TARDIS + Jhoira's Timebug + Silverskin Armor

Medomai the Ageless

Idris, Soul of the TARDIS

Jhoira's Timebug

Silverskin Armor

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. Activate Jhoira's Timebug by tapping it, putting a time counter on Idris.
6. Move to your extra turn.
7. At the beginning of your upkeep, Idris's vanishing ability triggers, removing a time counter from it.
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 clever loop relies on Idris, Soul of the TARDIS copying Medomai the Ageless to completely bypass Medomai's usual restriction against attacking during extra turns. By using Silverskin Armor to turn Medomai into an artifact before casting Idris, you ensure Idris can successfully imprint Medomai upon entering the battlefield. Once Idris gains Medomai's flying and extra-turn combat trigger, Jhoira's Timebug steps in to manipulate Idris's Vanishing 3 counters, keeping the TARDIS from fading away before it can continuously secure infinite turns for you.