Aminatou, the Fateshifter, Liliana Vess, Nexus of Fate, and Yennett, Cryptic Sovereign

Prerequisites

• Aminatou, the Fateshifter on the battlefield
• Liliana Vess on the battlefield
• Nexus of Fate in your library
• Yennett, Cryptic Sovereign on the battlefield
• Yennett does not have summoning sickness
• Liliana has at least three loyalty counters
• Aminatou has at least two loyalty counters
• Opponents are unable to kill Yennett

Steps

1. Activate Liliana's second loyalty ability by removing two loyalty counters from it, searching your library for Nexus of Fate, shuffling your library and putting Nexus of Fate on top of your library
2. If Liliana has less than three loyalty counters remaining, activate Aminatou's second loyalty ability by removing a loyalty counter from it, blinking Liliana
3. Otherwise, activate Aminatou's first loyalty ability by putting a loyalty counter on it, drawing Nexus of Fate and putting it back on top of your library
4. Proceed to your combat phase, and declare Yennett as an attacker
5. Yennett triggers, revealing Nexus of Fate from the top of your library and causing you to cast it without paying its mana cost
6. Resolve Nexus of Fate, getting an extra turn after this one and shuffling it into your library
7. Repeat each turn

Results

• Infinite turns