I find Nettle Sentinels to be very useful in an switchover to Aggro. He's also a decent enough clock in the early game that must be answered.

Against other aggro decks, he's no better than a grizzly bear.
Against other aggro decks, you want Symbiote to give you time to setup with the C.A. Elves (visionary, wood elves, v.shaman). If your opponent targets your elves at this point, you're winning.

Is 1 Deranged Hermit enough of a mid game card to warrant a consideration?
What about ambush commander?

Neither of these cards helps against mass sweep. Both cost 5 but provide an army.
The former makes many blockers and can be abused with Symbiote. Gaea's Cradle seems obvious here.