Rakdos Lizards is a low-to-the-ground aggressive deck, and Flashfreeze is a cheap, efficient answer because nearly all of their spells are red, including the black-red gold cards like Fireglass Mentor, Gev, Stingerquill Charm and Ingris Stingerquill, as well as Burst Lightning, Valley Flamecaller and Hired Claw. Only Iridescent Vinelasher slips past it. The extra Erode gives more cheap unconditional removal for their efficient threats like Hired Claw and Iridescent Vinelasher. Cut the slower Three Steps Ahead and Plunder the Trollshaws, since you need to prioritize surviving their fast curve over grinding long games. Keep Day of Judgment and Pinnacle Starcage, both excellent against their wide, cheap aggressive board.