Prototype Portal, Clock of Omens, Battered Golem, and Ancient Den

Prerequisites

• Prototype Portal on the battlefield
• Clock of Omens on the battlefield
• Battered Golem on the battlefield
• Ancient Den in exile

Steps

1. Activate Prototype Portal by paying , creating a token copy of Ancient Den
2. When the Ancient Den token enters the battlefield, Battered Golem triggers, untapping itself
3. Activate Clock of Omens by tapping Battered Golem and the Ancient Den token, untapping Prototype Portal
4. Repeat

Results

• Infinite landfall triggers
• Infinite tapped Ancient Den tokens