Medomai the Ageless + Idris, Soul of the TARDIS + Karn's Bastion + Neurok Transmuter
4-card combo · URW
Verdict
Yes — this 4-card loop chains infinite turns by exploiting Idris's triggered exile to reset Medomai's 'can't untap during extra turns' restriction.
- Cards required
- 4
- Cheapest stack total
- $3.02
- Color identity
- URW
- Popularity
- 0 decks
- Format
- Commander
Neurok Transmuter turns Medomai the Ageless into an artifact so Idris, Soul of the TARDIS can exile and effectively reset it on entry, sidestepping Medomai's clause that prevents untapping during the extra turns it generates. Karn's Bastion replaces the time counter Idris loses each upkeep to its own vanishing, keeping it alive indefinitely while Idris itself deals the combat damage that fuels each subsequent extra turn. The whole engine requires an opponent unable to block, so the combo lives or dies on that setup piece — Bedlam, Goblin War Drums, or evasion granted by the commander shell.
Recipe
How it works
01
Prerequisites
An opponent cannot block creatures you control.
02
Steps
- Activate Neurok Transmuter's first ability by paying
, causing Medomai the Ageless to become an artifact until end of turn. - 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 6.
03
Result
Infinite turns; Lock
Variations
Cheaper, tighter, alternate lines
Strionic Resonator can copy Medomai the Ageless's extra-turn trigger if the Idris line feels too exposed to bounce or flicker hate targeting Idris itself. If Karn's Bastion is removed, any other proliferate effect — Flux Channeler, Tekuthal, Inquiry Dominus — can substitute as the counter-replacement engine, since the loop only needs one proliferate trigger per extra turn to sustain Idris.
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-8
Updated . Data from Commander Spellbook, Scryfall, and EDHREC.