Since you have white slivers it would be a good idea to look into bonescythe sliver, because it gives all slivers double strike.
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This deck looks really nice, only thing is i would recommend definitely mainboarding goblin guide, its an amazing one drop and can help win many games a lot quicker.
If you want the deck to be more potent, try adding some more creatures, or adding digging spells to get to the creatures.
Thanks for the advice, I put in a few goblin bushwhackers for a few more low drop hasty creatures.