This deck is all about discarding cards and bringing them out en masse, either for their own power or to be used as Xyz Material. The two heavy hitters are Boot-Up Admiral and Machina Citadel. Boot-Up is the easier of the two to bring out, as the Gadgets can easily be brought out by each other, and even from the graveyard thanks to cards like Pinpoint Guard. Citadel, meanwhile, is best brought out using Air Raider's effect. Machina Fortress is there as a reliable 2500 beatstick that is ridiculously easy to summon, and if it gets taken out, there's always Megaform to fall back on. The Gadgets exist mainly to either provide discard fodder or to be used as Xyz Material themselves. Fortress and Citadel can be brought out from the graveyard so cards like Twin Twisters and Fortress itself can discard them easily. Most of the Xyz Monsters are Rank 4, but there are a couple of Rank 8, as well as 1 Rank 7 (brought out by Fortress) and a couple Rank 5 (which is where Jumbo Drill comes in).
This is not a strictly meta deck, but I did not have the budget to get a bunch of Infinitrack cards.
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