Spellbinder, Aggravated Assault, and Turnabout

Prerequisites

• Spellbinder on the battlefield
• Aggravated Assault on the battlefield
• Turnabout in exile
• Spellbinder attached to a creature that cannot be blocked and killed by an opponent
• The creature with Spellbinder attached can attack this turn
• Lands you control can tap to produce at least

Steps

1. Deal combat damage with the creature that has Spellbinder attached
2. Spellbinder triggers, casting a copy of Turnabout without paying its mana cost
3. Resolve Turnabout, untapping all tapped lands you control
4. Move to your postcombat main phase
5. Activate all mana-producing lands you control by tapping them, adding at least
6. Activate Aggravated Assault by paying , untapping all creatures you control and causing you to get an addtional combat phase and main phase after this one
7. Repeat

Results

• Infinite combat damage
• Infinite combat phases
• Infinite magecraft triggers
• Infinite storm count
• Infinite untap of lands you control
• Infinite mana lands you control can produce