Not bad, not bad. It has a pseudo Lyra effect (since it's restricted to healing spells only it procs on healing effects). I like it, but please don't make me make a list featuring all druid spells. Those are a lot. :C
 Come to think of it, I really like this card design-wise. It suits the pacifist "restoration" specialization quite well.
I like the healing synergy they are pushing for the druids. Suits the class better than the armor one we had now imo. Treants, healing, buffing - sounds like a druid to me.
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“If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.” ― George Bernard Shaw
While there could still be a card that brings this all together, I don't think Heal Druid does enough powerful things to see play, especially when you consider the infinite value of Shaman and Rogue, and the better defensive capabilities of Paladin and Warrior.
This is a different way to combat aggro decks. Aggro needs to damage you asap and keep the damage rolling, while this card produces early game value when that archetype is faced. It's cool to see an anti-aggro strategy that doesn't revolve around taunts or cheap board clears.
Then it's just a matter of how good and how consistent random druid spells are.