Tainted Field is a great replacement for Orzhov Guildgate, roughly 0.30$ more each, but could really benefit you by coming into play untapped. A very flavorful deck! Also check out Eternal Thirst from M15, it begs to be put in this deck.
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Dreadbore in sideboard or in exchange for a couple of those Terminates. Planeswalkers man. I understand why you put in flaring pain, but at the same time can't help but feel like there might be a better alternative. I'll think on it.