Ashnod the Uncaring, Akul the Unrepentant, Cloudstone Curio, and Abhorrent Overlord

Prerequisites

• Ashnod the Uncaring on the battlefield
• Akul the Unrepentant on the battlefield
• Cloudstone Curio on the battlefield
• Abhorrent Overlord in hand
• You control at least three additional creatures

Steps

1. Activate Akul the Unrepentant by sacrificing three creatures
2. Ashnod the Uncaring triggers, copying Akul the Unrepentant's ability
3. Resolve the copy of Akul the Unrepentant's ability, putting Abhorrent Overlord from your hand onto the battlefield
4. When Abhorrent Overlord enters the battlefield, it and Cloudstone Curio trigger
5. Resolve the Abhorrent Overlord trigger, creating a number of 1/1 Harpy creature tokens equal to your devotion to black
6. When the Harpys enter the battlefield, Cloudstone Curio triggers that many times, returning nothing to your hand from the battlefield
7. Resolve the Cloudstone Curio trigger from step 4, returning Akul the Unrepentant from the battlefield to your hand
8. Resolve Akul the Unrepentant's ability from step 1, putting it onto the battlefield from your hand
9. When Akul the Unrepentant enters the battlefield, Cloudstone Curio triggers, returning Abhorrent Overlord from the battlefield to your hand
10. Repeat

Results

• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers