I made this deck a going second deck because it doesn't have much in the terms of negates and many of the monsters are based around interacting with other monsters. Each Vaylantz card has the ability to special summon themselves from the pendulum zones and some of the cards are based around moving the cards around so you can summon as many Vaylantz as possible. Some of the Vaylantz need the field spells out to special summon so you generally want them out at all times. All the Vaylantz have a pendulum number of 1 so your goal is generally to use Instant Fusion > Couverture + a Vaylantz or 2 Vaylantz to summon Beyond the Pendulum and search Kai-Den (the best high pendulum for this deck because it returns to the hand after pendulum summoning allowing for more Vaylantz stuff.)
Shinonome is the number one most important card. When summoned it searches a Vaylantz spell (usually the field spell or solo activation) and when moved it searches a Vaylantz monster. Mad Marquess excavates 1-6 cards to add one Vaylantz. Another very good starter if you already have Shinonome. Solo Activation can get both of them out as well as Beyond the Pendulum if you already have Kai-Den.
Nazuki and Buster Baron are the two Vaylantz monsters that move other monsters on summon which makes them vital for activating Shironome and getting all your Vaylantz out. Senet Switch and Solo Activation from the graveyard are also movement options.
The Place of Beginning searches your field spells, searches Senet Switch, and can get a Vaylantz from the extra deck to the field. Voltage Viscount also gets Vaylantz from the extra deck to the field.
Saion isn't always reliable due to the coinflip but can be used to deal with the enemy's monsters. It can negate, halve attack, destroy, or return to the hand. Dominator Duke can stop a trap or spell from being activated and can steal an enemy's monster to be used as fusion material. Both are useful for dealing with the opponent's field.
Hojo returns a spell or trap to the hand but his main purpose is as a Pendulum Fusion when he gets moved. You generally want to save one movement option to be able to move him. You use him to get out your Vaylantz boss monsters.
The playstyle of this deck is based all around moving monsters around in order to get out your material and reach your end board. As a result, you generally want to be conscious of where you're placing your monsters and spells at all times. This deck definitely isn't meta but it can be very fun.
P.S: I added Arrival Cyberse as an out to Mystic Mine.