I think as a standalone card, this is underwhelming and would not see any play
If limiting the success of greedier decks is a goal of yours, there are many ways to address the issue that will not also hamstring two-color decks: Limit the payoffs for playing many colors
Its an interactive take on removal, since it lets the targets stick around for abilities etc., but it is still very powerful
Preordain was an excellent follow-up to a Jace zero ability, giving you a fresh top of the deck
Im pleased to report that once again, if youre actually able to find any packs to buy, Phantasmal Flames continues Mega Evolutions new-found generosity when it comes to pull rates
Remember, proxies are meant for fun and testing - support the official game by purchasing real cards for tournament play and collecting.