with the extra earth from the gnome riders chuck in a graboid or two, as the nova's and the immolations will get your time quanta, and take out the rage potion because it really is only good for the smaller creatures unless you use it on yourself but the chance of drawing it is very little. the big creatures are the ones you have to worry about, and if your deck is faster it can win before the AI even get them out.
For T50 it is hard to win as most of the decks in there are those that they farm AI 3 or AI 6 (false gods). And the false god decks normally have antimatter or some other creature control. The AI 3 will generally be upped so they will have an advantage over you.