Activate Saheeli by paying and tapping it, creating a token copy of Glamermite with haste.
When the token Glamermite enters the battlefield, it and Mana Echoes trigger.
Resolve the Glamermite trigger, untapping Saheeli.
Holding priority, if you control less than four creatures that share a creature type with Glamermite, repeat steps 1 through 3 one additional time.
Resolve all Mana Echoes triggers, adding C for each creature you control that shares a creature type with Glamermite for each trigger resolved this way.
Activate Energy Refractor twice by paying 4, adding .
Repeat.
This clever loop turns Saheeli, the Sun's Brilliance into an engine for infinite copies by repeatedly targeting Glamermite with its tap ability. Each time the token copy of Glamermite enters the battlefield, its triggered ability untaps Saheeli so the process can begin anew. Simultaneously, Mana Echoes exploits the shared creature types to flood your pool with colorless mana as each token arrives. You can then funnel that colorless energy through Energy Refractor to filter it into the exact colored mana you need to sustain Saheeli's activations.