Mortuary, Myr Scrapling, Cauldron of Essence, and Bolas's Citadel

Prerequisites

• Mortuary on the battlefield
• Myr Scrapling on the battlefield
• Cauldron of Essence on the battlefield
• Bolas's Citadel on the battlefield

Steps

1. Activate Myr Scrapling by sacrificing it
2. When Myr Scrapling dies, Mortuary and Cauldron of Essence trigger
3. Resolve the Mortuary trigger, putting Myr Scrapling from your graveyard onto the top of your library
4. Resolve the Cauldron of Essence trigger, causing you to gain 1 life and each opponent to lose 1 life
5. Resolve the Myr Scrapling ability
6. Cast Myr Scrapling from the top of your library by paying 1 life
7. Repeat

Results

• Infinite +1/+1 counters on creatures you control
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite sacrifice triggers
• Infinite storm count