Oh boy I never expected Syrus Truesdale deck can be taken seriously. This deck is so consistent to spit out Mobile Base protected with Connection Zone. As long as you have the 3 cards mentioned,
Instant Fusion + 1 roid + fusion spell, you're good to go. Combo:
https://bit.ly/2E8HmUX. I'll explain card by card and their role in deck.
The roid (Speedroid): Double Yoyo (for Halq/Accesscode OTK), Terrortop (best roid, free/searcher), 2 Den-Den Daiko Duke (extender for Halq OTK), Taketomborg (extender), 3 Tri-Eyed Dice (best fusion fodder, negates atk from GY).
3 Keeper of Dragon Magic: Instant Fusion/other fusion spell searcher while being Megaroid City fodder.
Predap package: 1 Ophrys Scorpio (Instant Fusion/other fusion spell searcher while being Megaroid City fodder), 2 Lonefire, 2 Darlingtonia Cobra (2 just in case its drawn).
Fusion spell: Instant Fusion (summons Pair Cycroid for Mobile Base material), 3 Vehicroid Connection Zone (protection and make Mobile Base cant be negated), 1 Poly (Keeper/Ophrys/Verte other target) and 1 Fusion Gate (Set Rotation target).
3 Megaroid City, Set Rotation, and Terraforming: Best card, searches Connection Zone or roid (Speedroid) monster.
1 Emegeroid Call: Negation, also Megaroid City target.
The rest is just staple cards.
Extra deck: 2 Mobile Base (it can summon its copy from extra deck), Pair Cycroid (combo piece). Jumbo Drill (piercing, for pushing damage), Kitedrake (beater and floats), and Chanbara (4.6k damage output) are all just Mobile Base target. Halq/Selene/Accesscode (OTK), Masq (small resource disruption), Cherubini (sends Daiko Duke for link climb/Halq play), Verte (plan B for fusion spell). Knightmares and Borreload as generic good link monster.
Pros: Consistent 5k protected tower that generates plus every turn, can OTK, and big staple slot.
Cons: 3 cards combo, Megaroid City locks to fusion for the entire turn.
Cards to think of: Fusion Recycling Plant (great field but needs discard, we already have too many discard effect and we dont even need the recovered material, Tri-Eyed Dice is better in GY), Halq combo (summons roid from deck but clashes with Megaroid City, so its preferred to use Halq as OTK instead of going first).