Mortuary, Bolas's Citadel, Fanatical Firebrand, and Sifa Grent

Prerequisites

• Mortuary on the battlefield
• Bolas's Citadel on the battlefield
• Fanatical Firebrand in hand
• Sifa Grent on the battlefield

Steps

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

Results

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