Medomai the Ageless + Idris, Soul of the TARDIS + Karn's Bastion + Ygra, Eater of All
4-card combo · WUBRG
Verdict
Yes — this 4-card loop generates infinite turns by looping Medomai the Ageless through Idris, Soul of the TARDIS and sustaining Idris with Karn's Bastion.
- Cards required
- 4
- Cheapest stack total
- $11.78
- Color identity
- WUBRG
- Popularity
- 0 decks
- Format
- Commander
Medomai the Ageless earns the first extra turn on a successful hit; Idris, Soul of the TARDIS enters and exiles Medomai, then attacks during that extra turn to grant another. Karn's Bastion refills the time counter Idris loses each upkeep via vanishing, preventing it from ever leaving the battlefield — which means Medomai stays exiled and the loop never collapses. The prerequisite, that opponents cannot block, is non-trivial but is covered by commanders like Najeela, the Blade-Blossom or a Reconnaissance already in the 99 of a 5-color shell.
Recipe
How it works
01
Prerequisites
An opponent cannot block creatures you control.
02
Steps
- Deal combat damage to an opponent using Medomai the Ageless.
- Medomai the Ageless triggers, causing you to take an extra turn after this one.
- Cast Idris by paying
. - When Idris enters the battlefield, it triggers, exiling Medomai the Ageless until Idris leaves the battlefield.
- Move to your extra turn.
- At the beginning of your upkeep, Idris's vanishing ability triggers, removing a time counter from it.
- Activate Karn's Bastion's second ability by paying
and tapping it, putting a time counter on Idris. - Deal combat damage to an opponent using Idris.
- Idris triggers, causing you to take an extra turn after this one.
- Repeat from step 5.
03
Result
Infinite turns; Lock
Variations
Cheaper, tighter, alternate lines
Unwinding Clock can stretch Karn's Bastion activations across other players' turns, but it is not required — one activation per loop cycle is enough. Grafted Exoskeleton or Embercleave on Idris turns the combo into an infect lock rather than a pure turns engine, closing the game faster if opponents develop board presence during assembly.
Related
Other combos sharing these cards
Tekuthal, Inquiry Dominus + Magistrate's Scepter + Lithoform Engine + Karn's Bastion
Infinite turns; Lock
Verified on Commander Spellbook · Combo ID idris-soul-of-the-tardis-karns-bastion-medomai-the-ageless-11
Updated . Data from Commander Spellbook, Scryfall, and EDHREC.