So this is an interesting one... Vylons aren't terrible and have seen a few semi competitive variants through the years, but only one of those is even remotely playable, that being omega turbo. A weird sacky deck that takes a large amount of setup, but puts up some insane boards if it pops off.
The Combo (element, Kay-est, vylon equip spell, non-tuner vylon):
Element summons a tuner from deck whenever an equip spell is destroyed (not once per turn ), kay-est pops cards equipped to the card it's equipped to, and the vylon equips all float into another one when the are sent to grave. This gives you a shit ton of link material (or synchro, or xyz) to do basically whatever you want. the issue comes from the fact that this is a four card combo that takes two specific cards that aren't really searchable.
This version of the deck is mainly just to shit out a ton of links to do shit. This is most likely not the optimal build of the deck, but it can be funny