Zethi, Arcane Blademaster, Nexus of Fate, and Scroll of Fate

Prerequisites

• Zethi, Arcane Blademaster in hand or in the command zone
• Nexus of Fate in hand
• Scroll of Fate on the battlefield
• You have a way to kill a creature
• An opponent is unable to block and kill your creatures
• available on each extra turn
• plus enough mana to pay for commander tax, if applicable, on the first turn available

Steps

1. Activate Scroll of Fate by tapping it, manifesting Nexus of Fate
2. Kill Nexus of Fate, causing it to be put into your graveyard
3. Cast Zethi kicked once by paying and commander tax, if applicable
4. Zethi enters the battlefield, exiling Nexus of Fate from your graveyard with a kick counter on it
5. During any other turn, declare Zethi as an attacker attacking an opponent unable to block and kill it
6. Zethi triggers, causing you to pay to cast a copy of Nexus of Fate
7. Resolve the Nexus of Fate copy, causing you to take an extra turn after this one and shuffle your library
8. Repeat from step 5 each turn

Results

• Infinite turns