Ysiel Windsinger is an interesting card, and this deck is not only built to take advantage of her mana reduction, but wants specifically to use her to do some weird stuff with Scale of Onyxia and Survival of the Fittest. The rest of the deck is your basic Spell-heavy Druid for Glowfly Swarm, and of course we have to run Wildheart Guff because the class says Druid.