Regrettably, Tithe is on the Reserved List, so it is ridiculously expensive for the effect you get, but if you want an inexpensive alternative that is slightly watered down, Gift of Estates plays reasonably well, trading instant speed and doubling its mana cost for a guaranteed 3 plains cards
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I would cut honestly about ten lands and add ramp in it's place, not simply for more mana to advance in general, but less is more
Casting any creature spell at all buffs her
Quite simply, Windriddle Palaces is the most fun you are going to have in a plane, and I havent had any card stick more often than it, because its essentially fair, interesting, and intriguing