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It's your deck so do what you like, but 3 out of 4 Nationals winners agree that it's not worth the card slot. Whatever you decide, cutting a dominant for Storehouse is never a good idea.For the record, having played multiple Zebulun decks and won Nationals with Zebulun based deck, Storehouse is definitely NOT necessary to use him.
Im not really cutting a dominate for it, the only one thats not in there is harvest time (or the hopper) and since 2 of my EC become LS and joseph before pharaoh can also gererate a LS (or multiple LS's is recurred), Im not worried about getting LS out (I would like to put the hopper in, but storehouse is more useful, saying i can search for it, it lets me draw, makes mayhem more useful, and helps me use zeb, which is hard with how much this deck draws)