Not suprised everyone thinks Regis are piles of shit
Like most Pokmon cards, the value of Luxray ex depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Twilight Masquerade)
The upside of the mechanic is that you have the ability to build a creature stack to your liking, whether thats making a small one with a cool ability larger or giving a larger one neat abilities
Legality depends on the tournament format -- Scurry of Squirrels can be legal in some formats and banned or restricted in others
Reshiram- EX would act as either a main attacker, or a back up attacker, depending on the situation, or depending on the deck its facing
- Protects cards during and after the game