Ragost, Deft Gastronaut, Cauldron Familiar, and Warren Soultrader

Prerequisites

• Ragost, Deft Gastronaut on the battlefield
• Cauldron Familiar on the battlefield
• Warren Soultrader on the battlefield

Steps

1. Activate Warren Soultrader by paying 1 life and sacrificing Cauldron Familiar, creating a Treasure token
2. Activate Cauldron Familiar by sacrificing the Treasure, which is a Food due to Ragost, returning Cauldron Familiar from your graveyard to the battlefield
3. When Cauldron Familiar enters, it triggers, causing each opponent to lose 1 life and you to gain 1 life
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers
• Infinite lifegain triggers
• Infinite lifeloss