While it might seem enticing to simply cheat in big, huge power and toughness creatures, Reanimator decks dont win by just turning cards sideways (usually): they win by bringing in back-breaking cards that do many things upon their Enter the Battlefield effects
However, these cards perform an important role as a safety netif things go too far, the format has a way of self-correcting, and we were missing these types of answers when Emrakul, the Promised End, Aetherworks Marvel, and Smuggler's Copter were breaking Standard
the sets sometimes come with exclusive designs or even different Pokemon to the ones we receive in the West on occasion
You can do whatever you want
The -8 doesnt win the game like a lot of ultimates, but if you put it in a Mono-Blue deck, JUST IMAGINE THE VALUE
Thats fair