Famous examples include the Legendary Dragons (could fuse with anything of a certain category to create a new monster with varied effects), Neo Galaxy-Eyes Tachyon Dragon (could "time travel" by reverting the gamestate), The Seal of Orichalcos (allows a player to put Monsters in the Spell/Trap Zone), Supreme King Z-Arc (counted as Fusion, Synchro, Xyz, and Pendulum simultaneously), and the Meklord Emperors (consisted of five monsters summoned simultaneously to make a whole)
For my first real post, I'll share my idea for a custom archetype based on the "Mirror Force" series
This is why the leaves the battlefield trigger really helps because it keeps your counters in play like modular, but also counts if it is bounced, flickered, or airbent
Outside of the Trainer Gallery, which is seeing values increasing across the board on its top cards, this set is otherwise quite steady in value