Requires

Karn, Legacy Reforged must be on the battlefield. Lithoform Engine must be on the battlefield. Clock of Omens must be on the battlefield. Staff of Domination must be on the battlefield. Grim Monolith must be on the battlefield. You control at least three additional artifacts. Mana needed:

Steps

1. At the beginning of your upkeep, Karn triggers.
2. Holding priority, activate Lithoform Engine's first ability by paying and tapping it, copying Karn's ability.
3. Resolve the copy of Karn's ability, adding for each artifact you control that cannot be spent to cast nonartifact spells.
4. Activate Clock of Omens by tapping Staff of Domination and Grim Monolith, untapping Lithoform Engine.
5. Activate Staff of Domination's first ability by paying , untapping it.
6. Activate Grim Monolith's second ability by paying , untapping it.
7. Repeat from step 2.

Results