I love slivers a lot, they're my favorite type of creature, but holy crap dude. This is amazing. Too bad it isn't legal in Standard.
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Why do you have hallowed fountain? As a basic rule of thumb, unless something has an amazing effect, don't pay life for it. And don't put it in your deck 4 times. (As a side note, if you don't post in the deck description and how to play areas, nobody is going to care. It's a pain to hover over every card and read its effects. You have a really good deck here, draw some attention to it!)