I am not saying that the best thing against Counter-Top is Lavamancer, but in my opinion, and my testing in this has proved the point from my perspective at least, turn one Lavamancer is the way to go if you know you're against the deck. Chances are in most games both pieces won't yet be in play so you have a turn or two extra to work up some better damage, rift bolt gets through most of the time and fireblast gets through. with all of that in mind I'd gladly play the Lavamancer over any other 1cc in a zoo deck.