This hits hard, gives you value right away, and overwhelms the opponent if left unchecked for even a turn
A few of the cards that were removed from the base set reappeared in later sets
While cards like Elsa, Spirit of Winter and Elsa, Snow Queen do the freezing, cards like Anna, Heir to Arendelle and various rush characters take advantage of the exerted glimmers
Decadent Dragon Decadent Dragon is one of the best threats of the set
As for Ral Zarek, himself, I kind of imagine him seeing moderate success as a random one- or two-of in some U/R/x control decks, but more interestingly, I imagine someone building a new kind of blue aggro or midrange deck that actually takes advantage of Ral Zareks ability to remove blockers or do six to the face
While Snapcaster Mage is bizarrely overpowered, it has had the effect of getting creatures into more decks than would otherwise be willing to play them