Magistrate's Scepter + Lithoform Engine + Karn's Bastion + Doubling Season

4-card combo · G

Verdict

Yes — this 4-card package generates infinite turns in any green proliferate or superfriends shell that can sustain 6 mana per loop.

Cards required: 4
Cheapest stack total: $3.67
Color identity: G
Popularity: 73 decks
Format: Commander

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Karn's Bastion proliferates for 4 mana; Lithoform Engine copies that ability for 2, doubling each trigger through Doubling Season to land four charge counters on Magistrate's Scepter from a single activation. Three counters off Magistrate's Scepter buys an extra turn, and Karn's Bastion alone sustains the loop every other cycle — the table never untaps again once the chain starts.

Recipe

How it works

Prerequisites

Magistrate's Scepter has at least one charge counter on it.

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.

Result

Infinite turns; Lock

Variations

Cheaper, tighter, alternate lines

The loop demands Magistrate's Scepter enter with at least one counter already on it, so a proliferate outlet like Planewide Celebration or a Hardened Scales effect is worth running to prime it. Inexorable Tide or The Ozolith won't replace any piece here, but redundant proliferate sources such as Evolution Sage let the deck function if Karn's Bastion is Strip Mined before the engine assembles.