Luminous Broodmoth, Flayer of the Hatebound, and Phyrexian Altar

Prerequisites

• Luminous Broodmoth on the battlefield
• Flayer of the Hatebound on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Flayer of the Hatebound, adding one mana of any color
2. Flayer of the Hatebound's undying ability and Luminous Broodmoth trigger
3. Resolve the Flayer of the Hatebound trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it
4. Flayer of the Hatebound enters the battlefield, dealing damage equal to its power to any target
5. The Luminous Broodmoth trigger fails to resolve due to having no legal target
6. Activate Phyrexian Altar by sacrificing Flayer of the Hatebound, adding one mana of any color
7. Luminous Broodmoth triggers, returning Flayer of the Hatebound from your graveyard to the battlefield with a flying counter on it
8. Flayer of the Hatebound enters the battlefield, dealing damage equal to its power to any target
9. Activate Phyrexian Altar by sacrificing Flayer of the Hatebound, adding one mana of any color
10. Flayer of the Hatebound's undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
11. Flayer of the Hatebound enters the battlefield, dealing damage equal to its power to any target
12. Repeat from step 6

Results

• Infinite colored mana
• Infinite damage
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers