This decklist I've crafted attempts to revive the Vaylantz archetype with Elfnote/Medius support. The optimal route is starting with Medius (Hence 3 Medius, 3 Theorealize, 3 Small World, side 3 Vandalism). Synchro into Justiciar for the chain block search to Lucina. Search Regina into Fortuna to Aristea to set up a movement option. Link into Lyna with the lights, which triggers Justiciar's SS into Lee to add Guardragon. Succession lets you reborn a tuner, so pick what you want from the graveyard according to your situation. If you need a Vaylantz starter, summon Crocodragon for the extra card draw (consistently Power Patron + Lee + Regina for 2 draws). After finishing all your special summons for Elfnote and World Legacy, start combo with Vaylantz. You want to wait for this since they all lock your special summons. From there remember you have a limited number of searches, so pick each card carefully to continue setting up your endboard. Speaking of which, you won't always have the same endboard since it's dependent on how many Vaylantz cards you draw. That's about it, sideboard is pretty self-explainatory - sub in what you prefer. This deck runs better in Master Duel since you have access to Electrumite there, though the TCG version is functional without it. Have fun confusing yourself and your opponents!