Requires

Wormfang Manta must be in hand. Scroll of Fate must be on the battlefield. Obelisk of Undoing must be on the battlefield. Mana needed: each turn

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 Obelisk of Undoing 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