No, stickers and attractions are not banned from Commander
Now, were seeing more and more enchantments get it, which means it plays well with cards that care about permanents, like Evolution Witness
Once in play, this is frequently more powerful than Crypt Rats can be, but the more expensive cost and difficulty in recurring it should it be countered or sacrificed can often make it less favourable
(They do pick up points with their parallel flavor texts, starting with To the sorrow of all, its [thing in title].) Theyre meant to play together in some five-color conflagration, although any pair of them is usually fine
These tokens dont have Haste, but they can be used to grow your copy of Warden of the Inner Sky already in play to set up a lethal attack
not to say that Mystic Sanctuary isn't very good, but it's more about the miserable and repetitive experience it creates rather than anything else