Rage of Bahamut is a collectible Card game that is free to play, supported by micro-transactions. This game features 3 factions that the player can join. You acquire cards through packs and quests and merge the cards together to level them up or improved their rarity.
The game borrows many elements from the Mafia-Wars style facebook games. You have energy and stamina, and can proceed through various quests using energy, and engage in battle with stamina. Both regenerate naturally, or can be recharged using items.