I agree with Jmizzle. Cheap sources of card advantages are often OP in most CCG. Anyway I voted for sundial, pulverizer (the 1 gravity cost is really too small) and... congeal. I just can't stand such a powerful control card, especially when it can be used every turn with just 3 water quanta, potentially shutting down most strategies for 4 turns which, very often, is too much. At least an Otyugh can be controlled... a congeal can't...
That's just my humble opinion.