man, Kill Switch is a card I've been trying to shove into a deck for over a decade. Unfortunately I'm not sure it's great here. I'd love a judge to chime in, but I'm pretty sure Kill Switch will tap your own stuff down, and then your creatures won't untap on your turn (even when the Switch itself does). Their stuff untaps before yours does.
Basically you can use to get one really good attack in (declare attacks and then tap them before their blocks), and then you never get to attack again for the rest of the game. I don't know that it works in this deck.
Ask Kevin Cron about Kill Switch sometime (i.e. last night's VSL). ;)