then i can't use it...
The essentials of a speedbow is obviously, speed! However, most cards used in speedbows, if unupped, are weaker (creatures; therefore slower damage), or more costly (usually permanents and control; therefore slower card usage). Even ignoring all this, supernova is simply a card that is required in the vast majority of speedbows, as pillars and to a certain extent towers, do not give you enough quarta quickly enough.
However, the decks shown above this seems very good if you are looking for a bronze farmer.