Yawgmoth, Thran Physician, Cruel Celebrant, and The Skullspore Nexus

Prerequisites

• Yawgmoth, Thran Physician on the battlefield
• Cruel Celebrant on the battlefield
• The Skullspore Nexus on the battlefield

Steps

1. Activate Yawgmoth by paying 1 life and sacrificing the undying creature
2. When the creature dies, Cruel Celebrant, The Skullspore Nexus and the undying creature's undying ability trigger
3. Resolve the Cruel Celebrant trigger, causing you to gain 1 life and each opponent to lose 1 life
4. Resolve the The Skullspore Nexus ability, creating a X/X Fungus creature token
5. Resolve the undying trigger, returning the creature from your graveyard to the battlefield with a +1/+1 counter on it
6. Resolve the Yawgmoth ability, putting a -1/-1 counter on any creature and drawing a card
7. Activate Yawgmoth by paying 1 life and sacrificing another creature
8. When the creature dies, Cruel Celebrant triggers, causing you to gain 1 life and each opponent to lose 1 life Resolve the Yawgmoth ability, putting a -1/-1 counter on the undying creature and drawing a card
9. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite creature ETB
• Near-infinite creature LTB
• Near-infinite creature sacrifice triggers
• Near-infinite death triggers
• Near-infinite lifegain triggers
• Near-infinite lifeloss