Ygra, Eater of All, Cauldron Familiar, Umbral Collar Zealot, and Insidious Roots

Prerequisites

• Ygra, Eater of All on the battlefield
• Cauldron Familiar in the graveyard
• Umbral Collar Zealot on the battlefield
• Insidious Roots on the battlefield

Steps

1. Activate Cauldron Familiar by sacrificing a Food
2. Ygra triggers, putting two +1/+1 counters on it
3. Resolve the Cauldron Familiar ability, returning it from your graveyard to the battlefield
4. Cauldron Familiar and Insidious Roots trigger
5. Resolve the Insidious Roots trigger, creating a creature token and putting a +1/+1 counter on each Plant you control
6. Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life
7. Activate Umbral Collar Zealot by sacrificing Cauldron Familiar
8. When Cauldron Familiar dies, Ygra triggers, putting two +1/+1 counters on it
9. Resolve the Umbral Collar Zealot ability
10. Repeat

Results

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