Melira's Keepers, Luminous Broodmoth, and Phyrexian Altar

Prerequisites

• Melira's Keepers on the battlefield
• Luminous Broodmoth on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Melira's Keepers, adding one mana of any color
2. Melira's Keepers dies, triggering Luminous Broodmoth, returning Melira's Keepers from your graveyard to the battlefield without a flying counter on it
3. Repeat

Results

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