Cards like Lord of Tressorhorn and the best Phyrexian Dreadnaught come unbidden to my mind, but there are many more out there
Etchings of the Chosen not only helps boost your Sliver army's power, it also can keep key Slivers alive to ensure you're not hamstrung on your way to eating your opponents' life total
Using these assumptions, this deck has 46 mana sources
Set It, Dont Forget It It would not be a stretch to say that Commander is a format where you absolutely want to get the maximum benefit for the least amount of mana
Trinket Mage can even get you lands, and pseudo-tutor cards like Astor, Bearer of Blades can fetch equipment from the top of your library
Any time you sacrifice a Clue, she can make one other target creature unblockable