Cloudstone Curio, Phyrexian Altar, and Abhorrent Overlord

Prerequisites

• Cloudstone Curio on the battlefield
• Phyrexian Altar on the battlefield
• Abhorrent Overlord in hand
• Your devotion to black is at least five
• available

Steps

1. Cast Abhorrent Overlord by paying
2. When Abhorrent Overlord enters the battlefield, it and Cloudstone Curio trigger
3. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield
4. Resolve the Abhorrent Overlord trigger, creating a number of 1/1 Harpy creature tokens equal to your devotion to black
5. When the Harpys enter the battlefield, Cloudstone Curio triggers that many times
6. Resolve the first Cloudstone Curio trigger, returning Abhorrent Overlord to your hand from the battlefield
7. Resolve all remaining Cloudstone Curio triggers, choosing to return nothing to your hand from the battlefield
8. Activate Phyrexian Altar seven times by sacrificing seven Harpys, adding
9. Repeat
10. If your devotion to black excluding Abhorrent Overlord is at least six, this combo will net infinite colored mana

Results

• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count