What is the Deck based on?
The archetype is based on the German opera "Der Freischütz", written by Carl Maria von Weber and premiered in 1821. According to German folklore, the term "Freischütz" refers to a marksman who made a contract with the devil to obtain seven magic bullets with supernatural accuracy. The first six bullets are subservient to the wielder's control, while the seventh will be in the devil's grip completely.
All members of this archetype are based on seven characters from the opera, in addition to sporting names and physical appearances to notable figures of American Western history and lore. Visually, all of them share three design aspects: a demonic-styled weapon, a clawed blue arm holding the weapon, and one or more large, red wings with blue eyes near the joint.
What Does the Deck Do?
This archetype revolves around using their monsters to accumulate their Spells/Traps in order to disrupt almost any moves their opponents may be attempting. All of their monsters can activate their effects when a Spell/Trap is activated in the same column as theirs (including opponent's). In addition, they also allows player to activate "Magical Musket" Spell/Traps from their hand, essentially turning them into hand traps, making their moves harder to predict and protect against.
Their monsters all have different effects, ranging from searching ("Caspar"), recycling ("Wild" and "Doc"), advantage generators ("Kidbrave" and "Zakiel"), and even swarming ("Starfire" and "Calamity"). Therefore, it is important to get those monsters onto the field as fast as possible. Since they're all LIGHT Fiends, they can utilize "Ties of the Brethren" as their main card to swarm the field, most of the time to bring out "Caspar", "Doc", and "Kidbrave" for maximum benefits.
Major Weakness/Downfalls
While powerful and consistent with their plethora of monster effects to generate advantage, it is also their greatest weakness. All "Magical Musket" Spells/Traps can only be activated while the player controls a "Magical Musket" monster, limiting their utility. Furthermore, they almost have no means of Special Summoning outside of their own theme (that doesn't rely on monster presence on the field), so any Summon negation cards such as "Forced Back", "Solemn Warning", "Chaos Trap Hole", and "Horn of Heaven" can help slow them down. Because of this Normal Summon dependence, this deck's particularly vulnerable when going second.
Hand traps are also effective against this deck, particularly "Effect Veiler", "Ghost Ogre & Snow Rabbit", "Herald of Orange Light", or "PSY-Framegear Gamma", since they can negate "Magical Musket" monster effects while also being out of reach from negation effect of "Cross-Domination". Mass-removal cards that can avoid "Last Stand" or "Fiendish Deal" are also effective to clear their entire field in one fell swoop, preventing them from activating more "Magical Musket" cards for the rest of that turn.