Alongside the Hivelord, Battle Sliver and Megantic Sliver give you uses for your extra mana to turn your Sliver army into an enormous force
Whether Raul is your Commander, or just helping make your mill deck flow smoothly, theres a lot of power to be had here
An argument could be made to include The Master, MultipliedThe Master, Multiplied in this upgraded deck, but I'll leave that up to you
Sure, your opponent gets too as well, but if youre dropping a creature with an exceptionally powerful enter the battlefield trigger, like Atraxa, Grand Unifier, a creature that is practically unstoppable like Emrakul, the Aeons Torn, or an enchantment that gives you free rein to do whatever you like Omniscience, you basically guaranteed a win