Yeah I realize those cards aren't in his deck but he could slip in a few multicolored lands to accommodate for those two black cards. The combo would work perfectly because the deck is based off of unblockable. I would only suggest doing that though if you are playing a free for all style game with multiple players.
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You should check out my sliver deck. Also if you put some of the enchantment "hive stirrings" that will help a lot in the beginning of the game if it is next to or near a manager sliver. ??
if you wanted to be a jerk with this deck, then you should put in exquisite blood and sanguine blood. These two cards make an infinite loop. When an opponent loses a life, you will gain that much life (exquisite blood). When you gain life, target opponent loses that much life (sanguine blood). I like to be a dick sometimes and that combo would do the trick.