Since this is a casual sliver deck there are two changes I am thinking about.
First is to make a pool of slivers that I randomly pull from to add to the deck. I would ensure one mana sliver, protection sliver, evasion sliver, card draw sliver, and the legends stay in permanently. The rest would be random.
Second, I am thinking about making The Prismatic Bridge the commander then. I would probably cut back on the number of slivers by a couple and replace with tutors to make up for not always having the
Sliver Overlord.
Thoughts?