Honestly... coming from Hearthstone.. this is WAY more F2P Friendly. I couldn't even imagine getting into Hearthstone Legend Rank without having to buy packs or grinding for 40 hours a week at a 51% win rate for the month.

Hitting Mythic on F2P is actually totally manageable in this game, and what I like is it's not just one aggro face deck. You can definitely get there with Aggro War, but a lot of Nature Core Cards are REALLY good and over statted for their mana cost. Lots of decks can be built around those.