Spellbinder, Hellkite Charger, and Turnabout

Prerequisites

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

Steps

1. Declare Hellkite Charger and the creature with Spellbinder attached as attackers, triggering Hellkite Charger
2. Holding priority, activate all mana-producing lands you control by tapping them, adding at least
3. Resolve the Hellkite Charger trigger, causing you to pay to untap all attacking creatures and get an additional combat phase after this one
4. Deal combat damage with the creature that has Spellbinder attached
5. Spellbinder triggers, casting a copy of Turnabout without paying its mana cost
6. Resolve Turnabout, untapping all tapped lands you control
7. Repeat each combat phase

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