I would say, Gemstone Mine will solve your mana issues as you can get any mana from it, (if you can find thran quarry) In my opinion Coat of Arms is a must in sliver decks, and muscle sliver is quite cheap 2 mana cost and gives +1/+1, and think about adding sinew sliver 2 mana cost and also gives +1/+1, battering sliver to give tremple and fury sliver for double strike, it's all your choice, and an honorable mention to virulent sliver for poison damage, and also cheap 1 forest 1/1 my sliver deck was based on 3 colors (g/r/w) had sliver queen, overlord and legion, having all of the slivers in a deck is not possible and not effective.
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