Saheeli, the Sun's Brilliance, Mana Echoes, Chromatic Orrery, and Sparring Mummy

Prerequisites

• Saheeli, the Sun's Brilliance on the battlefield
• Mana Echoes on the battlefield
• Chromatic Orrery on the battlefield
• Sparring Mummy on the battlefield
• Saheeli does not have summoning sickness
• available

Steps

1. Activate Saheeli by paying and tapping it, creating a token copy of Sparring Mummy with haste
2. When the token Sparring Mummy enters the battlefield, it and Mana Echoes trigger
3. Resolve the Sparring Mummy trigger, untapping Saheeli
4. Resolve the Mana Echoes trigger, adding for each creature you control that shares a creature type with Sparring Mummy
5. Repeat

Results

• Infinite ETB
• Infinite colored mana
• Infinite colorless mana
• Infinite creature tokens with haste