It can be a key card in various decks with its good presence and unrestricted effect
If Im going to put a Stadium into a deck, I always put in at least three so you have a better chance of drawing into them and so you can keep your opponents stadiums off the field
"Battle Region" is probably referencing Hisui and the fact it's a region full of Pokemon ready to kick yo butt
Negating the activation of Spell/Trap Cards can be amazing as well to stop certain power cards like Forbidden Droplet (provided they dont send a Trap Card), Dark Ruler No More , Triple Tactics Thrust , Lightning Storm , or Harpies Feather Duster
Legendary creatures are incredibly powerful, especially in our modern era of Commander-centric card design
Card Number: EX Battle Boost [EBB] 094/093 Generation 6: Reshiram (Legendary Shine Collection [CP2] 002/027) In Generation 6, Reshiram received a beautiful card in the Legendary Shine Collection [CP2]