Medomai the Ageless + Idris, Soul of the TARDIS + Thrummingbird + Memnarch

Medomai the Ageless

Idris, Soul of the TARDIS

Thrummingbird

Memnarch

How it works

1. Activate Memnarch's first ability by paying 1, causing Medomai the Ageless to become an artifact.
2. Deal combat damage to an opponent using Medomai the Ageless.
3. Medomai the Ageless triggers, causing you to take an extra turn after this one.
4. Cast Idris by paying 1.
5. When Idris enters the battlefield, it triggers, exiling Medomai the Ageless until Idris leaves the battlefield.
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 and Thrummingbird.
9. Idris and Thrummingbird trigger.
10. Resolve the Idris trigger, causing you to take an extra turn after this one.
11. Resolve the Thrummingbird trigger, putting a time counter on Idris.
12. Repeat from step 6.

This ingenious loop bypasses Medomai the Ageless’s notorious restriction against attacking during extra turns by turning the Sphinx into an artifact via Memnarch, allowing Idris, Soul of the TARDIS to enter the battlefield and imprint it. Because Idris copies all of Medomai's triggered abilities, dealing combat damage with the TARDIS successfully grants you extra turns once again. Meanwhile, Thrummingbird swoops in with its combat damage trigger to proliferate, adding time counters back to Idris's vanishing ability so the ship never fades away.