Etali, Primal Conqueror // Etali, Primal Sickness, Mortuary, and Bartolomé del Presidio

Prerequisites

• Etali, Primal Conqueror // Etali, Primal Sickness in hand
• Mortuary on the battlefield
• Bartolomé del Presidio on the battlefield
• available

Steps

1. Cast Etali by paying
2. When Etali enters the battlefield, it triggers
3. Holding priority, activate Bartolomé del Presidio by sacrificing Etali
4. When Etali dies Mortuary triggers, putting Etali on top of your library from your graveyard
5. Resolve the Bartolomé del Presidio ability from Step 3
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 +1/+1 counters on a creature
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite storm count
• Near-infinite magecraft triggers