I wouldn't recommend this to new players. Most competitive decks require a lot of vials (50k to 90k) to make. You start with 400 and the grind starts there. Like Hearthstone, there's now a huge pay wall for new players to just catch up to the game which will soon rotate. If you like Solo AI games you can, but it's not worth the 2gb+ space on your phone. If you want a card game, try Runeterra, it's f2p and the devs even listen to their community.