Gods Unchained is a new competitive trading card game backed by Coinbase and led by the former Director of Magic the Gathering: Arena.
The cards are real world tradable in an open economy, remember their stats and history, and you'll be able to play for keeps and earn valuable cards.
I have been playing this game for over a month now, and I love it. They are making constant card and GUI changes to improve the feel of the game, and to balance the cards before the initial release. Remember, the cards you buy before the release are ERC tradable tokens on the ethereum blockchain. The market right now is speculative, but it looks like it will have a similar valuation to a game like Magic the Gathering.
Gods Unchained is free to play and currently in beta.
You need to be invited to get in, but if you're interested in trying it you're welcome to use my beta key! https://godsunchained.com?beta-key=mkewQTJuDz
I highly recommend this game, you will love it.