Karn, Legacy Reforged
Lithoform Engine
Clock of Omens
Basalt Monolith
Grim Monolith

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
You control at least five additional artifacts.
2 available

   Steps

How does this combo work?
1
At the beginning of your upkeep, Karn triggers.
2
Holding priority, activate Lithoform Engine's first ability by paying 2 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 Basalt Monolith and Grim Monolith, untapping Lithoform Engine.
5
Activate Basalt Monolith's second ability by paying 3, untapping it.
6
Activate Grim Monolith's second ability by paying 4, untapping it.
7
Repeat from step 2.

   Results

What do I get from this combo?
Infinite colorless mana that can't be spent to cast nonartifact spells
Infinite mana artifacts you control can produce
Infinite untap of artifacts you control
Infinite colorless mana
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Liquimetal Torque
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Gilded Lotus
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Prismatic Lens
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Chrome Mox
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Lands
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