Najeela, the Blade-Blossom, Spellbinder, and Turnabout

Prerequisites

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

Steps

1. Declare Najeela and the creature with Spellbinder attached as an attacker
2. Najeela triggers, creating a 1/1 Warrior creature token that's tapped and attacking
3. Holding priority, activate all mana-producing lands you control by tapping them, adding at least
4. Activate Najeela by paying , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one
5. Deal combat damage with the creature that has Spellbinder attached, causing you to gain life equal to the amount of damage dealt this way
6. Spellbinder triggers, casting a copy of Turnabout without paying its mana cost
7. Resolve Turnabout, untapping all tapped lands you control
8. Repeat each combat phase

Results

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