To kill the Kraken really fast, make sure your side or the battle field in full (4 wizards), make sure you are the second person. Let the first get all the blows. Since the Kraken is Storm, its weak against myth, so before the Kraken puts up its shield, attack it with myth. If you don't have a myth spell, get a nacklace called choker of ferocity. It adds it to your deck (bottom part if you look at through backback).