Saheeli, the Sun's Brilliance, Mana Echoes, Pestermite, and Gemstone Array

Prerequisites

• Saheeli, the Sun's Brilliance on the battlefield
• Mana Echoes on the battlefield
• Pestermite on the battlefield
• Gemstone Array 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 Pestermite

Steps

1. Activate Saheeli by paying and tapping it, creating a token copy of Pestermite with haste
2. When the token Pestermite enters the battlefield, it and Mana Echoes trigger
3. Resolve the Pestermite trigger, untapping Saheeli
4. Holding priority, if you control less than four creatures that share a creature type with Pestermite, 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 Pestermite for each trigger resolved this way
6. Activate Gemstone Array twice by paying , putting two charge counters on it
7. Activate Gemstone Array's second ability twice by removing two charge counters from it, adding
8. Repeat

Results

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