XP (i.e. experience points) is earned after every match you play. Players gain 10 XP each time they complete a match, and a victory gives a player an additional +20 XP. If a player concedes before turn 5, they will forfeit all XP.
As you accumulate XP, you will level up and unlock Base cards as well as the different Heroes in the game. This will allow you to build your own decks and participate in Constructed mode. You need 100 XP points in order to level up.
While XP is always awarded in Ranked and Conquest modes, it's only awarded in Tutorial, Practice, and Private mode up to level 30.
Daily Quests
Currently, Skyweaver daily quests are as simple as playing a match to earn bonus XP.
Players receive 3 Daily Quests per day regardless if they login.
They can stack up a total of 10 (this is also the amount new player accounts will start with).
Each Daily Quest grants a bonus of 40 XP for a completing a match.