Hibernation Sliver makes all Slivers very difficult to kill as long as you have life points and mana left to play with, and with all your creatures so cheap you would usually have plenty of both when it counted
Double the life stakes with each flip
Your strongest option is going to be getting Fishbone Quill into play, as that will help you accelerate your ramping capabilities even faster
Scratched If a card has scratches on the surface, this makes the card GOOD at best
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Overall, like most of the recent precon decks, this is a solid base to build on