Archaeomancer, Riptide Laboratory, and Turnabout

Prerequisites

• Archaeomancer in hand
• Riptide Laboratory on the battlefield
• Turnabout in hand

Steps

1. Activate any number of lands by tapping them, adding at least
2. Cast Turnabout by paying , untapping all lands you control
3. Cast Archaeomancer by paying
4. When Archaeomancer enters the battlefield, it triggers, returning Turnabout from your graveyard to your hand
5. Activate Riptide Laboratory's second ability by paying , returning Archaeomancer from the battlefield to your hand
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite storm count
• Infinite mana lands you control can produce
• Infinite magecraft triggers
• Infinite untap of lands you control