Double-faced permanents with daybound and nightbound can't transform via any means other than their daybound and nightbound abilities
Decks in the game are built upon the principles of various colors (supposedly representing martial arts styles: Red - a more energy heavy attack style, Blue - a more defensive fighting style, Orange - tends to focus on allies, drills, and setups, and Black - which has a large amount of board manipulation), races (Saiyan - which is primarily a physical combat style and Namekian which focused on deck regeneration and manipulating the discard pile), or "Freestyle" cards, which represent no specific style, but can be interjected into a deck regardless of Tokui-Waza
He's one of my favorite Lord cards, and is part of one of my favorite tribes
UL Ultimate Rare Limited Limited Brilliant Fusion X SPELL Continuous When this card is activated: Fusion Summon 1 "Gem-Knight" Fusion Monster from your Extra Deck, using monsters from your Deck as Fusion Material, but change its ATK/DEF to 0