Wormfang Manta, Whisperwood Elemental, and Shadow Guildmage

Prerequisites

• All permanents on the battlefield
• Shadow Guildmage does not have summoning sickness
• available

Steps

1. Tap Shadow Guildmage for to put Wormfang Manta on top of your library
2. Wormfang Manta's LTB triggers, granting you an extra turn after this one
3. At the beginning of your end step, Whisperwood Elemental triggers, manifesting Wormfang Manta
4. Pay to turn it face up
5. Repeat for infinite turns

Results

• Infinite turns