The primary functional difference between them (besides having different names) is that Red Elemental Blast can only target blue cards, whereas Pyroblast can target any card and only counters it or destroys it if its blue
Furthermore, at the beginning of each end step, if a player lost 4 or more life during that turn, you draw a card
Its difficult to find balance with sweepers, as they have a way of either ending the game on their own or not mattering much at all, with games where they fall somewhere in-between being rarer than either extreme
For Jin-Gitaxias, youre looking at a whopping 1/544 to get a specific version
The set will include Stitch, Elsa, Cruella De Vil, Maleficent, Robin Hood, and Captain Hook, and there will also be a special Mickey Mouse promo card
This is especially true if the abundance of removal and enemy creatures are multicolor