Mortuary, Skirk Prospector, Bolas's Citadel, and Arnyn, Deathbloom Botanist

Prerequisites

• Mortuary on the battlefield
• Skirk Prospector in hand
• Bolas's Citadel on the battlefield
• Arnyn, Deathbloom Botanist on the battlefield

Steps

1. Cast Skirk Prospector by paying its mana cost
2. Activate Skirk Prospector by sacrificing it
3. When Skirk Prospector dies, Mortuary and Arnyn trigger
4. Resolve the Mortuary trigger, putting Skirk Prospector from your graveyard onto the top of your library
5. Resolve the Arnyn trigger, causing target opponent to lose 2 life and you to gain 2 life
6. Cast Skirk Prospector from the top of your library by paying 1 life
7. Repeat from step 2

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite red mana
• Infinite creature sacrifice triggers
• Infinite storm count