I don't know what arena you guys are playing, but the one I have access to is loaded with decks that use balck-hole every other turn mixed with decks that put up a sanctuary at about the 2nd turn of the game and proceed to protect it too, just for good measure. So, while the Pestal deck above certainly can get some wins (somewhere around 50%), and it may even gain money fairly effectively due the the high rewards in gold, it is not consistent enough to reach the special spins. At least in about 10+ hours of trying I never got to one -- even though I am several thousand electrums richer.
It seems to me, that the gold arena has way too many decks that are prepared to deal with the denial decks, e.g. using sanctuaries powered novas, supernovas, immolations or counter-denials, such as black holes etc.