Urza, Prince of Kroog, Turnabout, Liquimetal Torque, and Archaeomancer

Prerequisites

• Urza, Prince of Kroog on the battlefield
• Turnabout in hand
• Liquimetal Torque on the battlefield
• Archaeomancer on the battlefield
• Lands you control can tap to produce at least

Steps

1. Activate Liquimetal Torque's second ability by tapping it, causing Archaeomancer to become an artifact until end of turn
2. Activate all mana-producing lands you control by tapping them, adding at least
3. Cast Turnabout by paying , untapping all lands you control
4. Activate Urza by paying , creating a token copy of Archaeomancer that is a 1/1 Soldier in addition to its other types
5. When the Archaeomancer token enters the battlefield, it triggers, returning Turnabout to your hand from your graveyard
6. Repeat from step 2
7. If lands you control can tap to proudce at least , this combo nets infinite mana, which can be used to activate Urza's ability infinitely and/or cast Turnabout choosing its other modes

Results

• Infinite creature copies of artifacts you control
• Infinite creature tokens
• Infinite ETB
• Infinite magecraft triggers
• Infinite mana permanents you control can produce
• Infinite storm count
• Infinite untap of permanents you control