While exiling your own creature is generally frowned upon, youll be gaining yourself 10,000 life, which is a huge amount in any game
Milling your opponent is actually positive for them unless you can finish them off, and there simply isnt enough lifegain to enable Hope as a potential win condition
Often, youll have to trade two cards for one of your opponents bigger threats this is where A Whole New World shines by refilling your hand
Remember, I am not saying these cards are bad or will not see play in other archetypes, they are just not slam dunk includes for over 1/5 of the metagame, in full playsets, for every player running a certain deck
They also create intrigue in the way they're built - after having done some research, I think there's obvious upgrades for both that aren't too hard to find
Whenever Vincent Valentine attacks, you may transform it