BU Infect Proliferation

the idea behind this deck is proliferation. my goal is to get at least one inexorable tide out, get a poison counter on the opponent, either via ichor rats or a hit from a plague stinger or other infect creature, and kill him via proliferation. im also trying to do this without having to purchase any expensive singles (the 4 baby jaces are probably the most ive spent on the deck everything else has come from packs, trades, and other lucky breaks). the deck is still very much under construction. still debating whether I should fit in additional Phyrexian Crusaders somewhere. the sideboard also needs work, as its just the infect & defile sideboard with a few cards swapped. advice is welcome and appreciated. :)