Medomai the Ageless + Idris, Soul of the TARDIS + Karn's Bastion + Memnarch
4-card combo · URW
Verdict
Yes — this 4-card package generates infinite turns once an opponent is locked out of blocking, snowballing a single Medomai the Ageless combat trigger into an unbreakable loop.
- Cards required
- 4
- Cheapest stack total
- $6.81
- Color identity
- URW
- Popularity
- 0 decks
- Format
- Commander
Memnarch converts Medomai the Ageless into an artifact so Idris, Soul of the TARDIS can exile it on entry, then Idris attacks for its own extra-turn trigger. Karn's Bastion refills Idris's time counters each upkeep before vanishing removes one, keeping Idris on the battlefield indefinitely and the loop running. The combo sits in Jeskai colors, where Teferi, Time Raveler and Grand Arbiter Augustin IV are natural fits for the control shell that also enables the unblockable prerequisite.
Recipe
How it works
01
Prerequisites
An opponent cannot block creatures you control.
02
Steps
- Activate Memnarch's first ability by paying
, causing Medomai the Ageless to become an artifact. - 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
Smoke or Crawlspace can replace incidental evasion enablers to satisfy the unblockable prerequisite more reliably than hoping combat tricks hold. Strionic Resonator is the lighter alternative to Idris if the goal is simply copying Medomai the Ageless's extra-turn trigger, though it lacks the vanishing recursion engine — the full 4-card line is slower to assemble but harder for opponents to interact with cleanly once Idris replaces Medomai in the attack step.
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-6
Updated . Data from Commander Spellbook, Scryfall, and EDHREC.