First one is garbage. It'd have been the nuts if it costed 8 mana.
Second one is good for quest hunter? Don't think of another archetype fitting this card.
The elemental is insane, will probably endure two turns. A nice buff for making viable a tempo mage with elementals with the new sidequest. And 2 mana free frostbolt is quite broken.
Druid one is just the nuts. Awesome for token druid, granted turn 1 and turn 2 with the coin, and quite flexible depending the match and your hand. Also viable in quest druid, since 2 mana 3/2 draw a card without any special condition (like questing explorer) is quite strong.