Felidar Guardian, Liliana, Death's Majesty, and Carrion Feeder

Prerequisites

• Felidar Guardian on the battlefield
• Liliana, Death's Majesty on the battlefield
• Carrion Feeder on the battlefield
• Liliana has at least four loyalty counters

Steps

1. Sacrifice Felidar Guardian to Carrion Feeder to put a +1/+1 counter on Carrion Feeder
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 ETB
• Infinite LTB
• Infinitely large Carrion Feeder
• Infinite sacrifice triggers