Earthcore: Shattered Elements, by Tequila Games, is a new collectible card game that's coming out soon.
In the game you not only collect cards, but can use them to craft new, more powerful cards. This allows you to customize your deck with over 500,000 possible cards to fit your play-style. The cards use a 3-element battle mechanic in a "rock, paper, scissors" fashion - Fire, Nature, and Water battle it out against each other. Earthcore includes a single player campaign as well as ranked multiplayer leagues and online PvP modes to satisfy competitive players.
There's no official launch date set yet, but until then you can drool over AppSpy's preview video of Earthcore: Shattered Elements.