Samwise Gamgee, Cauldron Familiar, and Ashnod's Altar

Prerequisites

• Samwise Gamgee on the battlefield
• Cauldron Familiar on the battlefield
• Ashnod's Altar on the battlefield
• You control a Food token

Steps

1. Activate Ashnod's Altar by sacrificing Cauldron Familiar, adding
2. Activate Cauldron Familiar by sacrificing a Food, returning it from your graveyard to the battlefield
3. When Cauldron Familiar enters the battlefield, it and Samwise triggers
4. Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain one life
5. Resolve the Samwise trigger, creating a Food artifact token
6. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB
• Infinite sacrifice triggers