Rootha, Mercurial Artist, Turnabout, and Emergence Zone

Prerequisites

• Rootha, Mercurial Artist on the battlefield
• Turnabout in hand
• Emergence Zone on the battlefield
• All other lands you control can tap to produce at least
• available

Steps

1. Activate all mana-producing lands you control except Emergence Zone by tapping them, adding at least
2. Activate Emergence Zone's second ability by paying , tapping and sacrificing it, allowing you to cast spells this turn as though they had flash
3. Cast Turnabout by paying
4. Holding priority, activate Rootha by paying and returning it from the battlefield to your hand, copying Turnabout
5. Resolve the copy of Turnabout, untapping all lands you control
6. Activate all mana-producing lands you control by tapping them, adding at least
7. Cast Rootha by paying
8. Repeat from step 4

Results

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