Insidious Roots, Peregrin Took, Cauldron Familiar, and Yahenni, Undying Partisan

Prerequisites

• Insidious Roots on the battlefield
• Peregrin Took on the battlefield
• Cauldron Familiar on the battlefield
• Yahenni, Undying Partisan on the battlefield
• You control at least one Food

Steps

1. Activate Yahenni by sacrificing Cauldron Familiar, giving Yahenni indestructible until end of turn
2. Activate Cauldron Familiar by sacrificing a Food, returning Cauldron Familiar to the battlefield from your graveyard
3. Cauldron Familiar and Insidious Roots trigger
4. Resolve the Insidious Roots trigger, creating a 0/1 green Plant creature token and a Food artifact token, and then putting a +1/+1 counter on each Plant you control
5. Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life
6. Repeat

Results

• Infinite +1/+1 counters on Plants you control
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB
• Infinite sacrifice triggers