Pulsemage Advocate, Altar of Dementia, and Sky Hussar

Prerequisites

• Pulsemage Advocate on the battlefield
• Altar of Dementia on the battlefield
• Sky Hussar on the battlefield
• Pulsemage Advocate does not have summoning sickness

Steps

1. Activate Altar of Dementia by sacrificing Sky Hussar, causing target opponent to mill cards equal to Sky Hussar's power
2. Activate Pulsemage Advocate by tapping it and putting three cards from an opponent's graveyard into their owner's hand, returning Sky Hussar from your graveyard to the battlefield
3. Sky Hussar enters the battlefield, untapping all creatures you control
4. Repeat

Results

• Infinite card draw for opponents
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of creatures you control