Etali, Primal Conqueror // Etali, Primal Sickness, Mortuary, and Viscera Seer

Prerequisites

• Etali, Primal Conqueror // Etali, Primal Sickness in hand
• Mortuary on the battlefield
• Viscera Seer on the battlefield
• available

Steps

1. Cast Etali by paying
2. When Etali enters the battlefield, it triggers
3. Holding priority, activate Viscera Seer by sacrificing Etali
4. When Etali dies Mortuary triggers, putting Etali on top of your library from your graveyard
5. Resolve the Viscera Seer ability from Step 3, keeping Etali on the top of your library
6. 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
7. Cast Etali and any other nonland cards exiled this way without paying their mana costs
8. 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 scry 1
• Infinite storm count
• Near-infinite magecraft triggers