Tawnos, Solemn Survivor, Retreat to Coralhelm, Caged Sun, and Vault of Whispers

Prerequisites

• Tawnos, Solemn Survivor on the battlefield
• Retreat to Coralhelm on the battlefield
• Caged Sun on the battlefield
• Vault of Whispers in the graveyard
• Tawnos does not have summoning sickness
• "Black" 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 Vault of Whispers from your graveyard, causing you to create a token of Vault of Whispers
2. When the Vault of Whispers token enters the battlefield, Retreat to Coralhelm triggers, untapping Tawnos
3. Activate the Vault of Whispers 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 Vault of Whispers token and causing you to mill two cards
6. Repeat from step 2

Results

• Infinite landfall triggers
• Infinite self-mill
• Infinite tapped Vault of Whispers tokens