This deck is quite tricky to use, that's why I need to guide you.Elemental Hero Neos / Neo-Spacian cards have a quite outdated mechanic for the modern standards.
To make them playable enough, you need to skip most Neo-Spacian cards and their Fusion counterparts. I would like to cut-down 1 Neos but "Miracle Fusion" (banish materials) is on the way and without Neos you can't play the game at all."Keeper of the dragon magic" basically enables the whole deck. By discarding 1 card you can search for "Neos Fusion". "Neos Fusion" can summon "Rainbow Neos" which is among the strongest cards of the game cause, it can destroy pretty much everything on the field.
While most old Neos fusion monsters return to the deck at the END PHASE, these new Neos Fusion monsters do not. In your next turn you can always use "Miracle contact" to summon again 1 "Rainbow Neos" and recycle the materials into the deck.
I feel like there are times that you don't get to hand the best cards possible, that's why this deck has "Card Destruction" and "Morphing jar". You might have to run "Neo space connector" up to x3 copies and Neos to x2.
Via "Neo space connector" and "Keeper of the dragon magic" you cansummon Neos quite easily without problem and with "Wrath of Neos" you can destroy all the cards on the field.
The only Neo-Spacian monsters I am using are, "Neo-Spacian Air Hummingbird" and "Neo-Spacian Glow Moss" cause their Fusion counterparts are decent enough.
Legacy of the Duelist Link Evolution is not a fast-paced game as Master Duel is. And it might be possible to use all Neo-Spacians in the deck for nostalgia reasons. But as you can see from this deck, you don't really need them, while all of these Fusion monsters takes so much space from the extra deck.
"Elemental Hero Brave Neos" fusion monster is one of the best to search for a Neos spell/trap card.While "Elemental Hero Neos Knight" is quite good to kill 2 monsters in a turn (vs "Gravekeeper's Spy" and "Gravekeeper's Nobleman" for example).
***DANGER - For some reason this is not working: use "Neos Fusion" by sending as materials "Elemental hero Neos" and "Elemental HERO Liquid Soldier". This way you can draw 2 cards, while you create a nice setup for the next turn to "Miracle fusion" from grave to draw gain 2 cards.