These codes are only used during design and development and are always gone before the file goes to anyone else
It will most likely never happen, but if you can high roll your life and guess what is in it, you could make your leader 13,000 power during your opponents turn
Im sure someone has thrown a Whispersilk Cloak on Akki Underminer and killed a couple of permanents but even then your opponent chooses what permanent to sacrifice
I have Tampas own Matt Newnam to thank for reminding me about the blue version of Lurking Predators
A big effect like The Eternity Elevator's or Infinite Guideline Station's is potentially game-ending, but there is every chance they'll be removed before you get the chance
Even if you don't have him, Blade of SelvesBlade of Selves (84,636 decks) does a good impression, for a whopping nine mana