Mardu Pyromancer and Jund are two of the most obvious shells for the new token generator in Modern. But it will most likely end up in a lot more midrange decks that run red mana.
If it turns out to be as good as it looks, then Seasoned Pyromancer should go up in price. Otherwise, it'll go all the way down.
But let's keep out fingers crossed, as it is one heck of a card!