Saheeli, the Sun's Brilliance + Mana Echoes + Gemstone Array + Deceiver Exarch

Saheeli, the Sun's Brilliance

Mana Echoes

Gemstone Array

Deceiver Exarch

How it works

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