I'm in the camp of almost always coining out a 2 drop turn 1 on the draw, assuming I have a second 2 drop to follow it up. (With certain exceptions.. I won't coin out a loot horder against a mage if I have 2 of them, for example). Yeah, if I miss a turn later it sucks, but that's really not that likely.. I'll probably have something to play turn 3 and 4 regardless of whether I have the coin or not.
Now, here's a question: How do you use innervate? Say my opener is Innervate, Yeti, Harvest Golem.. I'll 100% pass turn 1, yeti turn 2, and golem turn 3. But there are much harder decisions I routinely have to make with my druid deck, and I'm pretty sure I get a lot of them wrong.
Let's start with this one: Turn1, on the draw, your hand is Innervate x2, Yeti, Cairne, Ysera, Coin. What's the play? My pick would be to coin out Yeti.. but maybe coining out Cairne is better? I'm not sure.