Wormfang Manta, Scroll of Fate, and Erratic Portal

Prerequisites

• Wormfang Manta in hand
• Scroll of Fate on the battlefield
• Erratic Portal on the battlefield
• each turn available

Steps

1. Activate Scroll of Fate by tapping it, manifesting Wormfang Manta from your hand
2. Pay to turn Wormfang Manta face up
3. Activate Erratic Portal by paying and tapping it, returning Wormfang Manta from the battlefield to your hand
4. Wormfang Manta's LTB ability triggers, creating an extra turn after this one
5. Repeat each turn

Results

• Infinite turns