Breath of Dreams, a Druid spell, has several layers of awesome. First of all, it draws you a card. Second, it works exactly like the pre-nerf Wild Growth if you're holding a dragon. Lastly, it ushers in the Ysera legendary card for Druid in its artwork.
Breath of Dreams is definitely a card every Druid player should look after. Since it's a rare card, you can craft it for measly 100 dust.