Duels in Magic the Gathering Puzzle Quest are played on a board full of different-colored gems. To get mana and summon creatures you need to match three or more gems of the same color, keeping in mind that certain heroes get more mana from specific colors. Nissa, for instance, gets more mana from green rather than blue gems.
Another thing to keep in mind is the order in which you play your cards. Depending on how you do this, you can summon different creatures. Some of them attack your opponent directly, while others attack your opponent's creatures. With spells you can improve your creatures' attributes ... and do lots of other things.
Magic the Gathering Puzzle Quest is a mix between two amazing concepts, and it works perfectly. It has really good graphics, and a good amount of content in terms of cards, characters, and missions.
Requires Android 4.1 or higher