Often, whoever is playing Rising Waters has ways to get around it affecting them, so it's only hurting everyone else while they still get to play the game
A perfect curve for this deck would look something like this: Turn One: Duke of Weselton or Sergeant Tibbs Turn Two: Flynn Rider or Cruella de Vil Turn Three: Peter Pan Turn Four: Aladdin, Prince Ali or Aladdin, Street Rat Turn Five: Aladdin, Heroic Outlaw Turn Six: Genie, on the Job or Lefou, Instigator to Protect Aladdin You'll almost certainly be in top deck mode at this point, but there's a good chance you'll continue to pull high-impact cards like Kuzco, Tigger, Genie, and Aladdin throughout the rest of the game
6-mana for three 1/1 flyers and surveil 2 isnt amazing, but youre also fairly unlikely to die after you cast it thanks to those three bodies, and surveil 2 makes it likely youre going to draw something meaningful
We have a bunch of Enchantresses which help us draw cards when we cast our Enchantments, and almost all of them are 2 mana
But there is another type of crystal worth mentioning, which is also important in the context of Magic: The Gathering
Blue is getting another nice Curiosity effect this set in Enduring Curiosity, so this Room can provide some nice redundancy in a deck looking to capitalize on that