It hasn't been long since these cards have been revealed, so this list is the culmination of as much testing as I could do within that time. Keep in mind that optimal ratios and engines are subject to change.
Overview
The deck is mainly a 3-axis strategy that aims to set up a grindgame with Materiactor Exagard setting up further plays and storing nonengine as materials to add back to hand and use on your opponent's turn. The xyz armor package synergizes well for this, triggering Materiactor Meltdown twice, one of which will be a known card due to its first effect stacking your second topdeck, while you use Xyz Armor Torpedo to draw into the first for further extension.
The lines are greatly variable depending on the hand, but the main route typically goes like:
1. Overlay into Materiactor Exagard.
2. Use its effect to add Materiactor Meltdown.
3. Meltdown's first effect to reveal the top 6, in most cases adding a Materiactor name for extension. Then feel free to add back a material from Materiactor Exagard for extra gas. Materiactor Meltdown will attach additional materials to it through its trigger effect, so you won't have to worry about turning off its trigger effect.
4. Overlay an additional two level 3 bodies into Xyz Armor Torpedo. Ideally, you have access to Materiactor Zeptowing, who generates the bodies by itself as long as you have Baby Dragon in rotation. Feel free to add Materiactor Critical with its effect for an additional interruption, or something like Materiactor Exarept for extension.
5. Xyz Armor Torpedo effect to detach 2 and draw your stacked topdeck. This will trigger Materiactor Meltdown on a new chain to attach the next card to Materiactor Exagard as material.
6. Overlay Xyz Armor Fortress onto Xyz Armor Torpedo. Use its effect to search for Full-Armored Xyz. You will have to shuffle your deck after searching, but this will trigger Materiactor Meltdown again.
This is a basic line that gets you a non-target attach from Full Armored Dark Knight Lancer after resolving Full-Armored Xyz, while mostly likely putting nonengine under Materiactor Exagard to use on your opponent's turn. Ideally you'll have Baby Dragon in rotation to get the bounce effect too. This doesn't sound like much, but most hands will allow you extend far past this and end on additional interaction like Hieratic Seal of the Heavenly Spheres or Materiactor Critical.
Misc Important Points
-Remember to stack the rest of the cards with a plan! You typically want to put some kind of generic extension like World Legacy Guardragon, or Emergency Teleport on top for Xyz Armor Torpedo to draw into, while putting a handtrap as the second card to attach to Materiactor Exagard, as material so you can add it back to your hand on your opponent's turn.
-Be mindful of what locks you. Materiactor Gigadra does xyz lock you, but ONLY when it's on field, which means that you're free to do link plays later in the turn as long as you're careful with managing its presence on the field. Guardragon Pisty and Spirit with Eyes of Blue both dragon lock you. Being mindful of these restrictions will give you maximal freedom in routing and ensure your ceiling remains high at all times.
-Use Red-Eyes Darkness Metal Dragon to cheat dragons out of your hand and unbrick otherwise lousy hands into full combo.
-The handtrap lineup is fully intentional. The ghost girls are 3s to potentially be used for rank 3 plays in a pinch, while also being tuners for Cupid Pitch. Effect Veiler serves a similar role, but doubles as a material to be linked off with Spirit with Eyes of Blue. It doesn't come up too often, but it's something to keep in mind. Bystials synergize well with Hieratic Seal of the Heavenly Spheres, and can sometimes be used as further extension, but because the list doesn't contain many chaos typed monsters, I opted for a humble ratio of 1 Bystial Druiswurm , 1 Bystial Magnamhut. As for handtrap ratios, running Ghost Ogre & Snow Rabbit is nice since it's occasionally a psychic for Emergency Teleport, but is also not a handtrap with a lot of coverage. Ash Blossom & Joyous Spring is naturally the most generic handtrap in the list, while Ghost Mourner & Moonlit Chill is at 2 due to its OPT restriction, which Effect Veiler lacks. All nonengine is kept with the intention of doubling as engine if the situation really calls for it.
-It goes without saying that the ratios are also intentional. 3 Materiactor Gigadra and 3 Black Metal Dragon offers you 6 normal summons, which is generally optimal for a 40 card deck. The deck is also kept at 40 cards to maximize the chances of seeing a materiactor name off Materiactor Meltdown. Materiactor Exarept is kept at 2 copies since it's a valued extender and extra name, but is generally not great to draw in multiples and all around is your worst maindeck monster, making you go ridiculously neg if it's ashed or belled.
150
240
450
450
