Etali, Primal Conqueror // Etali, Primal Sickness, Hua Tuo, Honored Physician, Thornbite Staff, and Umbral Collar Zealot

Prerequisites

• Etali, Primal Conqueror // Etali, Primal Sickness in hand or in the command zone
• Hua Tuo, Honored Physician on the battlefield
• Thornbite Staff on the battlefield
• Umbral Collar Zealot on the battlefield
• available

Steps

1. Cast Etali by paying and paying any commander tax if relevant
2. When Etali enters the battlefield, it triggers
3. Holding priority, activate Umbral Collar Zealot by sacrificing Etali
4. If Etali is your commander, choose not to return it to the command zone from your graveyard
5. When Etali dies, Hua Tuo triggers, untapping Hua Tuo
6. Resolve the Umbral Collar Zealot ability from Step 3
7. Activate Hua Tuo by tapping it, putting Etali on top of your library from your graveyard
8. Resolve the Etali trigger from step 2, causing you to exile cards from each player's library until you exile a nonland card, with you exiling Etali from your library
9. Cast Etali and any other nonland cards exiled this way without paying their mana costs
10. Repeat from Step 2

Results

• Cast any number of spells from opponents' libraries
• Exile each opponent's library
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite storm count
• Infinite surveil
• Near-infinite magecraft triggers