Felidar Guardian, Liliana, Death's Majesty, and Viscera Seer

Prerequisites

• Felidar Guardian on the battlefield
• Liliana, Death's Majesty on the battlefield
• Viscera Seer on the battlefield

Steps

1. Sacrifice Felidar Guardian to Viscera Seer to scry 1
2. Activate Liliana's -3 ability to return Felidar Guardian to the battlefield from your graveyard
3. When Felidar Guardian enters the battlefield, exile Liliana and return it to the battlefield with 5 loyalty
4. Repeat

Results

• Infinite death triggers
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite scry