Ashnod the Uncaring + Goblin Engineer + Corridor Monitor + Commander's Sphere

4-card combo · UBR

Verdict

Yes — this 4-card loop draws the library by recycling Commander's Sphere through Goblin Engineer while Ashnod the Uncaring doubles every activation for free.

Cards required

Cheapest stack total

$16.39

Color identity

UBR

Popularity

81 decks

Format

Commander

Buy required cards on TCGplayer

Goblin Engineer's activated ability puts Commander's Sphere back onto the battlefield; Ashnod the Uncaring copies that ability mid-resolution to also return Corridor Monitor, which enters and untaps Goblin Engineer. The whole loop costs 1 red per cycle — Commander's Sphere taps to produce it, then sacrifices itself to draw a card, making the engine self-sustaining once assembled. Grixis artifact commanders like Mishra, Claimed by Glistening or Breya, Etherium Shaper assemble this naturally while doing everything else they want to do anyway.

How it works

Prerequisites

Goblin Engineer does not have summoning sickness.

Steps

Activate Commander's Sphere's first ability by tapping it, adding .
Activate Commander's Sphere's second ability by sacrificing it, causing you to draw a card.
Activate Goblin Engineer by paying , tapping and sacrificing Corridor Monitor, targeting Commander's Sphere.
Ashnod triggers, copying Goblin Engineer's ability, targeting Corridor Monitor.
Resolve the first Goblin Engineer ability, returning Corridor Monitor from your graveyard to the battlefield.
Corridor Monitor enters the battlefield, untapping Goblin Engineer.
Resolve the second Goblin Engineer ability, returning Commander Sphere from your graveyard to the battlefield.
Repeat.

Result

Infinite card draw; Infinite draw triggers; Near-infinite death triggers; Near-infinite ETB; Near-infinite LTB; Near-infinite sacrifice triggers

Cheaper, tighter, alternate lines

Any 1-mana artifact that produces red can replace Commander's Sphere as the mana source, but the draw is Commander's Sphere's sacrifice trigger — lose it and the loop needs a separate outlet like Reckless Fireweaver or Disciple of the Vault to convert death triggers into a kill. If Corridor Monitor is unavailable, Implement of Improvement and any artifact with a cantrip sacrifice ability can fill the untap role, though Monitor's guaranteed Goblin Engineer untap is the cleanest line.

Ashnod the Uncaring + Goblin Engineer + Corridor Monitor + Commander's Sphere

How it works

Cheaper, tighter, alternate lines

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