Idris, Soul of the TARDIS + Lithoform Engine + Basalt Monolith + Sphinx's Disciple + Ashnod's Transmogrant

Idris, Soul of the TARDIS

Lithoform Engine

Basalt Monolith

Sphinx's Disciple

Ashnod's Transmogrant

How it works

1. Activate Ashnod's Transmogrant by tapping and sacrificing it, putting a +1/+1 counter on Sphinx's Disciple and causing it to become an artifact.
2. Cast Idris either from your hand or from the command zone by paying 1 and commander tax, if applicable.
3. When Idris enters the battlefield, its imprint ability triggers, targeting Sphinx's Disciple.
4. Holding priority, activate Lithoform Engine's first ability by paying 2 and tapping it, copying Idris' trigger, targeting Basalt Monolith.
5. Resolve both Idris triggers, exiling Basalt Monolith and Sphinx's Disciple.
6. During your next turn, activate Idris using Basalt Monolith's first ability by tapping it, adding CCC.
7. Activate Idris using Basalt Monolith's second ability by paying 3, untapping it.
8. Sphinx's Disciple triggers, causing you to draw a card.
9. Repeat from step 6.

This clever engine starts by using Ashnod's Transmogrant to turn Sphinx's Disciple into an artifact, paving the way for Idris, Soul of the TARDIS to enter the battlefield and imprint both the Sphinx and Basalt Monolith by doubling its enter-the-battlefield trigger with Lithoform Engine. Once imprinted, Idris inherits the incredible mana-generating and untapping activated abilities of Basalt Monolith alongside the inspired triggered ability of Sphinx's Disciple, letting you tap Idris for colorless mana and pay to untap it endlessly. Every time Idris untaps this way, the Sphinx's inspired ability triggers to draw you a card, resulting in an infinite loop of card draw powered by your own commander.