I have no clue how aggro/control will play out with the new cards, but healing to full and doing nothing else for 9 mana doesn't impress me. Against aggro before gvg its difficult enough to make it to turn 9, healing, even to full, while doing nothing about the state of the board isn't going to do much good when turn 9 you're looking at ~10 damage on the board. If aggro decks get even faster you can forget about ever having time to cast tree of life. Just thinking about using alexstrasza against aggro, I didn't always make it to turn 9 and even if I did and even with an 8/8 on the board it sometimes wasn't enough. I think I'd rather heal myself to 15 and have an 8/8 than heal my opponent and I to 30 and go right back to ~15. It might buy you another turn or two, which is huge in some cases, but not so much with druid because you will have no way of clearing the board afterwords, you'll just get overwhelmed considering any damage on the board when you cast it will be coming right back to you the following turn, your opponent will develop their board further, and then your next turn you will be forced to remove what is on the board, mana spent clearing is mana not developing your board. Without druid getting a board clear that isn't 10 mana and 3 cards I don't see this card working in constructed. That is my thoughts on the card at least, its too early to tell if it'll be good or not. Hmmm...just spotted it heals all characters and not just all heroes, not sure if that makes it better or worse.