Medomai the Ageless + Idris, Soul of the TARDIS + Karn's Bastion + The Flesh Is Weak

4-card combo · WUBR

Verdict

Yes — this 4-card loop generates infinite turns by keeping Idris, Soul of the TARDIS alive with Karn's Bastion while Medomai the Ageless sits in exile as the engine's ignition key.

Cards required

Cheapest stack total

$8.08

Color identity

WUBR

Popularity

0 decks

Format

Commander

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Medomai the Ageless deals combat damage to earn an extra turn, then Idris, Soul of the TARDIS enters and exiles Medomai until it leaves — that exile trigger is what seeds the loop. On each extra turn, Karn's Bastion spends 4 mana to replace the time counter that Idris's vanishing removes, keeping Idris on the battlefield permanently so it can swing for another extra turn of its own. The combo needs an opponent unable to block, at least one +1/+1 counter already on Medomai, and uninterrupted access to 4 colorless every upkeep — that last condition is the real gate.

How it works

Prerequisites

An opponent cannot block creatures you control. Medomai the Ageless has at least one +1/+1 counter on it.

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.

Result

Infinite turns; Lock

Cheaper, tighter, alternate lines

The Flesh Is Weak is listed as a combo piece but functions as a threat enabler elsewhere — any effect that makes creatures unblockable or an opponent's board empty achieves the same result. If Karn's Bastion is removed, the time counter refill disappears and Idris vanishes naturally, ending the loop cold; Vorinclex, Monstrous Raider doubling counters can cover gaps but requires green, pushing into a fifth color. There is no tighter substitute line here — the combo is already doing the minimum work for what it produces.

Medomai the Ageless + Idris, Soul of the TARDIS + Karn's Bastion + The Flesh Is Weak

How it works

Cheaper, tighter, alternate lines

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