Saheeli, the Sun's Brilliance, Mana Echoes, Sparring Mummy, and Crossroads Candleguide

Prerequisites

• Saheeli, the Sun's Brilliance on the battlefield
• Mana Echoes on the battlefield
• Sparring Mummy on the battlefield
• Crossroads Candleguide on the battlefield
• Saheeli does not have summoning sickness
• available, plus an additional if you control less than three creatures that share a creature type with Sparring Mummy

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. Holding priority, if you control less than four creatures that share a creature type with Sparring Mummy, repeat steps 1 through 3 one additional time
5. Resolve all Mana Echoes triggers, adding for each creature you control that shares a creature type with Sparring Mummy for each trigger resolved this way
6. Activate Crossroads Candleguide twice by paying , adding
7. Repeat

Results

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