Medomai the Ageless + Idris, Soul of the TARDIS + Karn's Bastion + Unctus, Grand Metatect
4-card combo · URW
Verdict
Yes — this 4-card package generates infinite turns once an unblockable attack connects, locking opponents out indefinitely.
- Cards required
- 4
- Cheapest stack total
- $3.48
- Color identity
- URW
- Popularity
- 0 decks
- Format
- Commander
Unctus, Grand Metatect converts Medomai the Ageless into an artifact for a phyrexian blue mana, letting Idris, Soul of the TARDIS exile it on entry and preserve the no-cast restriction that would otherwise stop Medomai from granting extra turns. Karn's Bastion replaces the time counter Idris loses each upkeep, keeping the loop alive turn after turn. The prerequisite — an opponent unable to block — is the real work; Medomai and Idris both need to connect, so evasion spells like Reconnaissance or a mass-unblockable effect are the true fourth piece in practice.
Recipe
How it works
01
Prerequisites
An opponent cannot block creatures you control.
02
Steps
- Activate Unctus 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
Smoke Shroud or Tetsuko Umezawa, Fugitive can reliably supply the unblockable condition without leaning on a dedicated combat trick each loop. The combo does nothing if Karn's Bastion is removed before the upkeep trigger resolves — Clockspinning is a cheaper backup to replenish Idris's time counter if the Bastion gets hit.
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-7
Updated . Data from Commander Spellbook, Scryfall, and EDHREC.