If I were blizzard, I would make the following changes.
Innervate, refreshes mana only, does not let you ramp
spreading plague, 7 mana (druid are meant to be super weak to wide boards)
rockpool hunter - now 2/2
war leader - now gives +2 attack, no health
gentle megasaur, now 3/4
mark of the lotus, now is choose one: +1 health or +1 attack, not both without fandral
patches, dies at the end of turn, maybe even returns to deck at end of turn, maybe dies once all pirates on board are dead, idk, something
Fandral, now 3/4
crypt taunt (forget name, 3 mana, 1/6 taunt, gain 1 hp when minion summoned) - 1/5, minion must be played to gain 1hp.
malfurion deathknight, 8 mana
jade idol, each jade idol played increases the cost of the next jade idol played by an additional 1 mana up to 10
Maybe something with ultimate infestation, sure... no armor gain and/or no 5/5 It's still an insane card imho.
Of course, this doesn't cover problematic RNG cards like barnes. And there are a couple cards I wouldn't mind seeing a tiny bit better. But as far as nerfs go, this is where I'd start.
Of course if Blizzard is discussing these kind of changes, we'd be super lucky to see 3 of them.