Prototype Portal, Retreat to Coralhelm, Ensoul Artifact, and Seat of the Synod

Prerequisites

• Prototype Portal on the battlefield
• Retreat to Coralhelm on the battlefield
• Ensoul Artifact on the battlefield
• Seat of the Synod in exile

Steps

1. Activate Prototype Portal by tapping it, creating a token copy of Seat of the Synod
2. When the Seat of the Synod token enters the battlefield, Retreat to Coralhelm triggers, untapping Prototype Portal
3. Repeat

Results

• Infinite blue mana
• Infinite landfall triggers
• Infinite Seat of the Synod tokens