Just an example, if you do the math, when you play Supernova you get 24 quanta. If you play an Quanta Tower, you get 3 random quanta on the turn you play it then 3 random every turn thereafter. Thus you have to wait 7 turns to get the amount of quanta you get from one turn of Supernove. Also the supernova guarantees 2 in each element whereas there are times you don't get the quanta in the amount, however small, you want with Towers. A lot of people feel Rainbow decks are running rampant in the game and the crux of those decks tends to be Supernova. Long story short, supernova is fine as it is.