Please note that Structure Deck EX can only be purchased once with gems.
By far the most powerful cards in this deck are Neos Fusion and NEXT. Neos Fusion is a great play-maker at any stage of the duel by sending to the graveyard any monster you need along with Elemental HERO Neos to make a Fusion monster. NEXT is a great late game card when your graveyard is already full of Neo-Spacians with Elemental HERO Neos. By doing this you are able to Fusion Summon into more difficult Neos monsters like Elemental HERO Storm Neos, Elemental HERO Chaos Neos, and Elemental HERO Divine Neos. The next best cards are Neos Space Connector, Elemental HERO Brave Neos, and Elemental HERO Storm Neos. Neos Space Connector can Special Summon Neo-Spacian/Elemental HERO Neos straight from your deck, and then tribute himself to revive a Neospacian/Elemental HERO Neos, making him great for setting up Contact Fusions or Regular Fusions involving Elemental HERO Neos. Elemental HERO Brave Neos is generally the best monster you can summon with Neos Fusion because of his search effect and not having the "return to Extra Deck" demerit. He also gains a little bit of attack for every Neo-Spacian and HERO monster in your graveyard. Elemental HERO Storm Neos is just really powerful but held back by his summoning condition. He can be used in a comeback combo when summoned with the monsters revived by NEXT. On the other hand, this deck contains lots of cards unrelated to it's strategy that should be replaced. Elemental HERO Captain Gold, Hero's Rule 2, and Card Blocker should be replaced first. Than you can replace the anything in the deck to optimize the Fusion Monster you choose to summon.
I find it hilarious how this deck has Captain Gold, a HERO specifically meant to work with Skyscraper, yet this deck has no Skyscraper, and is recommended to be played with the Pot of Greed skill instead of the skill that puts Skyscraper into the field.
The Pot of Greed skill itself is actually a bad one. Jaden has better skills to use. And including a card just to be used as Graveyard fodder is kinda....stupid. Especially if your best way to get it to the Graveyard includes wasting your Normal Summon on it.
So I agree, Konami should have either recommend the Skyscraper skill instead, or replace Captain Gold with Air Neos instead.