My first thought upon seeing this post, though I didnt say it, was "Add Worldy Tutor".
I just recently ditched a deck that had about as much reliance on a 4x Creature X as yours does on Druid. It could win without it, but it certainly didnt want to. It just seems like the typical case of "If things go well, they go really well, but if not, they go horribly." And I even had Demonic/Vamp/Imperial in the deck but it still didnt seem like enough.
I mean, you GOTTA get the druid, pretty much, and more than that, gotta get him early since he has the very inconvenient problem of summoning sickness.
Kind of like in my other thread with Tinker>DSC, I could envision, after your opponent figures out that druid is the key card, bouncing/killing him after you expend the effort to get him on the table.
With Summoner's pact, you get the card in hand (very, very important). Plus, for reasons just stated, you still have the mana now to play the card right then, and perhaps mana left for disruption (duress/therapy). If only the stupid druid had haste....

is pretty annoying though, next upkeep, plus you already have to spend

to use the hermit.
So maybe worldly tutor is the better bet. Whatever you do, I would definitely consider 1-2 more ways to find druid.