It's fantastic to be able to drop an Eldrazi Conscription or extra turn sorcery on the top of your library right before Narset swings, and while it is a way to abuse an already powerful ability, it doesn't waste my opponent's time and for the most part still preserves some of the randomness of playing the deck without Proteus Staff or Mana Severance
Hero is an attacking card and wants to be in a deck that is setup to attack effectively
While there are probably some small upgrades that can be made to the mono-blue build, like additional copies of Castle Vantress, to really improve the deck's weaknesses, we need to move into a second color for hard removal and sweepers
Mycosynth Lattice + Kill Switch is good
The guided portion of the set does an efficient job of laying down the groundwork, overall, and the decks themselves show off a variety of Pokmon and various card effects without getting too complicated
3 - 1st Tournament card stands as one of the most expensive and old rare Pokmon cards