Tekuthal, Inquiry Dominus + Magistrate's Scepter + Lithoform Engine + Karn's Bastion
4-card combo · U
Verdict
Yes — this 4-card package generates infinite turns in mono-blue by doubling proliferate triggers until Magistrate's Scepter never runs dry.
- Cards required
- 4
- Cheapest stack total
- $9.70
- Color identity
- U
- Popularity
- 222 decks
- Format
- Commander
Tekuthal, Inquiry Dominus doubles every proliferate trigger, so Karn's Bastion's activated ability puts two counters on Magistrate's Scepter instead of one; Lithoform Engine copies that ability for a total of four counters per cycle, clearing the three-counter cost for an extra turn with one left over. The loop costs 6 mana per full iteration — 4 for Karn's Bastion and 2 for Lithoform Engine — plus the Scepter's tap, so it demands significant mana infrastructure before it goes live.
Recipe
How it works
01
Prerequisites
Magistrate's Scepter has at least one charge counter on it.
02
Steps
- Activate Karn's Bastion's second ability by paying
and tapping it. - Holding priority, activate Lithoform Engine's first ability by paying
and tapping it, copying Karn's Bastion's ability. - Resolve both Karn's Bastion abilities, putting four charge counters on Magistrate's Scepter.
- Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, causing you to take an extra turn after this one.
- Move to your next turn.
- Activate Karn's Bastion's second ability by paying and tapping it, putting two charge counters on Magistrate's Scepter.
- Repeat steps 4 and 5 one time.
- Repeat from step 1.
03
Result
Infinite turns; Lock
Variations
Cheaper, tighter, alternate lines
Proliferate redundancy matters here: Flux Channeler or Inexorable Tide can replace Lithoform Engine if artifact copying is a removal target, though neither copies at instant speed. Any tutor that finds Magistrate's Scepter — Whir of Invention or Reshape — accelerates assembly; without Tekuthal doubling the output, the loop collapses entirely, so protect the Dominus or run Counterspell backup rather than swapping it out.
Related
Other combos sharing these cards
Brago, King Eternal + Lithoform Engine + Sol Ring
Infinite blinking of nonland permanents; Infinite ETB; Infinite LTB; Infinite mana artifacts you control can produce
Verified on Commander Spellbook · Combo ID karns-bastion-lithoform-engine-magistrates-scepter
Updated . Data from Commander Spellbook, Scryfall, and EDHREC.