Karn, Legacy Reforged, Lithoform Engine, Filigree Sages, and Chromatic Orrery

Prerequisites

• Karn, Legacy Reforged on the battlefield
• Lithoform Engine on the battlefield
• Filigree Sages on the battlefield
• Chromatic Orrery on the battlefield
• available

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 Filigree Sages by paying , untapping Lithoform Engine
5. Repeat from step 2

Results

• Infinite card draw
• Infinite colored mana
• Infinite colorless mana
• Infinite colorless mana that cannot be spent to cast nonartifact spells
• Infinite untap of artifacts you control
• Infinite draw triggers
• Infinite untap of artifacts