Fortunately for you and unfortunately for your opponents, because Blightsteel Colossus is indestructible, if they dont have an exile card, a creature 11 power or greater, or a horde of creature tokens with a total power of exactly 11, the game is done
The rest of the ratios look good, though I would prefer another board wipe or two: board wipes are good because your early turns are spent ramping, not developing a board presence, so a board wipe is a great catchup mechanic before you start dropping your haymakers
I think your concerns are valid
Try a few tools to see which one you like best for making a custom trainer card with your favorite pokemon
That said, this is definitely a card I could see making its way off the banlist at some point if Mox Opal does not overpower the format