Prototype Portal, Clock of Omens, Grinding Station, and Vault of Whispers

Prerequisites

• Prototype Portal on the battlefield
• Clock of Omens on the battlefield
• Grinding Station on the battlefield
• Vault of Whispers in exile

Steps

1. Activate Prototype Portal by paying and tapping it, creating a token copy of Vault of Whispers
2. The Vault of Whispers token enters, triggering Grinding Station, untapping Grinding Station
3. Activate Clock of Omens by tapping the Vault of Whispers token and Grinding Station, untapping Prototype Portal
4. Repeat

Results

• Infinite landfall triggers
• Infinite tapped land tokens