There's always, uh, Resounding Thunder/Wave/Silence?
Have fun with that 8 mana to draw a card. I'm pretty sure Earnest Fellowship + Painter's Servant + Iona means you win, if they don't have anything on the board (Vial, Dispeller's Capsule, etc.), and they can't run out a ton of man-lands. That combo is crushingly unfun.
I would actually worry more about a GW general than mono-W because of Tooth/Defense of the Heart. Pulling off a turn 3 Defense (Forbidden Orchard + they play a creature) into that lock is crazy good.