Tawnos, Solemn Survivor, Retreat to Coralhelm, Caged Sun, and Great Furnace

Prerequisites

• Tawnos, Solemn Survivor on the battlefield
• Retreat to Coralhelm on the battlefield
• Caged Sun on the battlefield
• Great Furnace in the graveyard
• Tawnos does not have summoning sickness
• "Red" chosen with Caged Sun
• You control at least two artifact tokens
• available

Steps

1. Activate Tawnos' second ability by paying , tapping it, sacrificing two artifact tokens and exiling Great Furnace from your graveyard, causing you to create a token of Great Furnace
2. When the Great Furnace token enters the battlefield, Retreat to Coralhelm triggers, untapping Tawnos
3. Activate the Great Furnace token by tapping it, adding
4. Caged Sun triggers, adding
5. Activate Tawnos' first ability by paying and tapping it, creating a copy of the Great Furnace token and causing you to mill two cards
6. Repeat from step 2

Results

• Infinite landfall triggers
• Infinite self-mill
• Infinite tapped Great Furnace tokens