Ygra, Eater of All, Cauldron Familiar, Chalk Outline, and Yahenni, Undying Partisan

Prerequisites

• Ygra, Eater of All on the battlefield
• Cauldron Familiar in the graveyard
• Chalk Outline on the battlefield
• Yahenni, Undying Partisan 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 Chalk Outline trigger
5. Resolve the Chalk Outline trigger, creating a creature token and a Clue token
6. Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life
7. Activate Yahenni by sacrificing Cauldron Familiar
8. When Cauldron Familiar dies, Ygra triggers, putting two +1/+1 counters on it
9. Resolve the Yahenni ability
10. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite lifegain triggers
• Infinite lifegain
• Infinite lifeloss
• Infinite +1/+1 counters on a creature
• Infinite Clue tokens