I took the 52 card version, and cut the fat. It means losing interaction, as well as the Fusion Destiny package, but frees up space in the extra deck and main deck, and increases consistency. You're a blind going second deck, with a bunch of options going first.
I'm going to start in a weird place. HEROES have many appeals, but I think a big one is the ROTAS. In addition to Reinforcement of the Army searching most of your starters, namely Stratos, Solid Soldier, and Liquid Soldier, and sometimes Shadow Mist, but E Emergency Call searches all of these as well as Honest Neos. A Hero Lives is the best of them all, starting you with a Stratos on the field without using a normal summon - your most insane hand is actually these 5 cards.
One thing to mention about A Hero Lives alongside Isolde, is that its a 1 card combo that ends on your choice of Darklaw + Absolute Zero + Sunrise + Mask Change, or Dread Decimator pointing to three Monsters. You can even end on Plasma + Sunrise + 1, off of just this one card. Thanks Isolde! You do this by going Stratos into Stratos, Stratos into Faris, then both Stratos into Isolde. From here there are a lot of lines you can take, and any other extenders or Rotas makes this way more powerful.
3 Stratos serve as the most important starter in your deck. These search any other creature in the deck off of a normal or special summon, which is pretty sweet, and the spell and trap removal is clutch too. 3 Faris is the other starter - this one card basically becomes 3 monsters, which is pretty good. You need 2 Increase and Vyon to search off of Faris.
Shadow Mist is the key searcher in the deck when forced to go first, and you need a way to special her to make Dark Law. The deck has plenty, from both of Solid Soldier's effects to one of Liquid Soldier's effects to Isolde in the extra deck. The searching effect is useful in pulling off OTKs with big boards full of monsters going second as well. It's either or on this card.
Solid Soldier and Liquid Soldier are both super-valuable cards, for different reasons. I'd run 2 Liquid easily if I has space, and I'd run 3 Solid, but the thing is with 5 Rotas you don't really need to. Solid Soldier can use both effects, and alongside Stratos can search Faris, make Isolde, find a monster to discard for Faris, and then use Isolde to summon either another Stratos or Shadow Mist. This is without other extenders. If you have something to discard to Faris, that's when the combo gets crazy - make Cross Crusader the usual way to extend combos as normal, and when you Fusion Summon Sunrise, you can special a monster from your GY, such as a Stratos to search a monster or a Shadow Mist to get a Mask Change. Liquid Soldier is super key as fusion material - the card draw is very valuable, while its summon effect is more icing, that-works well summoning Shadow Mist or Stratos. Sometimes I grab this with Isolde just to use as material, despite having its effects turned off for the turn.
2 Malicious are obligatory, even at 2 it's still pretty essential to the combo. 1 Plasma is the only other Destiny Hero to make the cut in the 40 card version. Shutting off Monster Effects is good, and the deck has ways to increase his mediocre power aplenty. This just adds to the potential going first plays.
Honest Neos is a searchable hand trap that helps with Trinity OTKS. We also have one Evil Hero Adusted Gold and one Dark Calling, to make Malicious Bane when needed.
For fusions Spells, we have 1 Poly to search off of Vyon, 1 Miracle Fusion to search off of Sunrise, 1 aforementioned Dark Calling, and 3 Mask Change.
We needed 5 equip spells to really get reliable summons off of Isolde, especially since sometimes you want to summon Faris off of her. Favorite Hero has become my favourite of them - it can help you pump Trinity up to 10000 ATK points with Honest Neos while also finding your mystic mine. Phoenix Blade is (funnily enough) sometimes useful just to banish E Heroes in you GY for The Shining, and is also just an equip you can get back for low cost. Axe of Fools hard negates effects on cards. This is good Omni-Negate bait at the least, and a nasty thing to put on Apollousa or Winda ect. Horn of the Unicorn and Malevolent Nuzzler aren't amazing, but they put in just enough work getting Dark Law above 3000 Atk points. They are primarily here so that if we see 2 equip spells, so long as one of them is one of these we can put them back into our deck.
Side deck is split into 2 parts - about half deals with backrow decks, while a little over half deals with monster decks (with Evenly Matched overlapping a bit). This lets you cut the Equip spells when you know you aren't going first for whichever interaction is appropriate in your matchup. The reason for the weird split on the spell and trap card removal is that against the Mystic Mine Burn decks it gives them more outs to name, making it harder to get a lock.