Cloudstone Curio, Phyrexian Altar, and Underworld Hermit

Prerequisites

• Cloudstone Curio on the battlefield
• Phyrexian Altar on the battlefield
• Underworld Hermit in hand
• Your devotion to black is at least four
• available

Steps

1. Cast Underworld Hermit by paying
2. When Underworld Hermit 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 Underworld Hermit trigger, creating a number of 1/1 Squirrel creature tokens equal to your devotion to black
5. When the Squirrels enter the battlefield, Cloudstone Curio triggers that many times
6. Resolve the first Cloudstone Curio trigger, returning Underworld Hermit 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 six times by sacrificing six Squirrels, adding
9. Repeat
10. If your devotion to black excluding Underworld Hermit is at least five, 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