Idris, Soul of the TARDIS, Lithoform Engine, Basalt Monolith, Sphinx's Disciple, and Encroaching Mycosynth

Prerequisites

• Idris, Soul of the TARDIS in hand or in the command zone
• Lithoform Engine on the battlefield
• Basalt Monolith on the battlefield
• Sphinx's Disciple on the battlefield
• Encroaching Mycosynth on the battlefield
• plus enough mana to pay for commander tax, if applicable available

Steps

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

Results

• Infinite card draw
• Infinite draw triggers