When players tap him, he puts the top two cards of their library into their graveyard - a useful way to enable Delirium, if a player's deck relies on that mechanic
Strength aside this type of "whole table interaction" is quite fun and I think most players would enjoy it - Even if they do end up getting overrun by a scurry of Squirrels
Mirror Room is basically Mirror Image in room form, which is a nice follow-up to the more expensive room, or a fine value play that bridges the gap until you can pay the full 7 mana on Mirror Room // Fractured Realm
Smothering Tithe or Narset, Parter of Veils, for example, won't work against Scroll Rack
With a lore value of 1, she adds depth to your deck, allowing you to delve into the captivating stories of the Disney universe