good add on the Medic, I love what that does against devotion and control match ups.  Problem I see you having is T1-4.  You can only funtionally kill one creature before you need to be dropping yours to set up, so you could be dead before you get a chance to go in.  I'd possibly cut the doom blades for early disruption instead, to get yourself into position for Lifebane/Sin Collecter T3 unless you need the trade-blocker of Agent.  
+2/3 duress/thoughtseize (if you can afford the life), giving you some disruption before they can get rolling.