This is the optimal build with 4 Elemental Hero's and 4 Neo-Spacian. it can summon 16-19 per-duel.
Best is to start with worm link then follow up with Harpie Dancer & DNA Transplant to change attribute the monster into Wind, so you can return Divine Neos back to Extra deck.
Give the trap Localize Tornado to AI. Fusion Summon Devine Neos with Fusion Gate, and active effect Harpie Dancer to return Devine Neos. Fusion Summon Divine Neos with Parallel World Fusion next turn, so you never deck out. Use Recycle to recycle the Parallel World Fusion to the deck then repeat the loop.