I would limit your deck to three colors at the most to reduce the risk of mana problems. If you are not having any mana problems I think this is a good deck for now. One of the things I personally like to do with thragtusk is to place a creature that makes me return a creature to my hand every turn then keep throwing down thragtusk and putting 3/3 beasts of the battlefield while gaining life.
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Fixed the tithe drinker in the deck problem but now I have tons of tithe drinkers in my sideboard when I should only have 4
Tithe drinker is not in my deck but for some reason it says I have 4 and it won't go away.