Been playing Magic The Gathering for a long time. If you, like me, love strategic fantasy card games, you will probably spend hours playing this fun game too.
The gameplay, balanced factions, and tutorials are all there and high quality, and this game is FREE!. You can pick from the undead type faction, the beasties, the mechs, the angels, the demons, the defenders, the fast attack warriors, and the nuker wizards types (not their 'in game' names). There are also some interesting choices everyone can use from a large pool of neutral cards too. The factions are creatively themed, like the defenders have a water samurai vibe going.
It really gets interesting because you can combine up to 3 factions in any one deck.
This game is full of mechanics that add to the player's satisfaction. For example, when you make a deck, you pick 3 commanders that can be any creature card and you start the game with those 3 cards in play, in a designated area.
So your awesome 3 best legendary creaturecards that you got lucky and drew from booster decks? Yeah, you start every game with those.
And as if satisfying deep strategic choices are not enough, the developers added very impressive artwork for each card! Honestly I enjoy all the beautiful artwork almost as much as the gameplay.
And if unique fantasy artwork isn't enough, the artwork is also animated!
You unlock plenty of cards playing through the campaign, which includes 8 missions for each faction. Also quests unlock you cards. Wins and losses generate you in game points which can buy boosters too. Also playing games gives you experience, and at the time of writing this I think you get a booster for every level you gain. So it does not feel as griindy as say, Hearthstone.
I would recommend this game even if it costed money. But is doesn't. So pick it up and go have fun.