Nexus of Fate, and Spellbinder

Prerequisites

• Nexus of Fate in exile
• Spellbinder on the battlefield
• Spellbinder attached to a creature that can attack this turn and that cannot be blocked and killed by an opponent

Steps

1. Deal combat damage with the creature that has Spellbinder attached
2. Spellbinder triggers, casting a copy of Nexus of Fate without paying its mana cost
3. Resolve Nexus of Fate, taking an extra turn after this one and shuffling your library
4. Repeat each turn

Results

• Infinite turns