Lithoform Engine, Tezzeret the Seeker, and Gilded Lotus

Prerequisites

• Lithoform Engine on the battlefield
• Tezzeret the Seeker on the battlefield
• Gilded Lotus on the battlefield

Steps

1. Activate Tezzeret the Seeker's first ability by putting a loyalty counter on it
2. Holding priority, activate Gilded Lotus by tapping it, adding three mana of any color
3. Activate Lithoform Engine's first ability by paying and tapping it, copying Tezzeret the Seeker's ability, targeting Lithoform Engine and Gilded Lotus
4. Resolve the copy of Tezzeret the Seeker's ability, untapping Gilded Lotus and Lithoform Engine
5. Repeat from step 2

Results

• Infinite colored mana
• Infinite mana artifacts you control can produce
• Infinite untap of artifacts you control