Free Bionic Dues Steam key.

All you have to do is send your e-mail, and they'll deliver you a free key.

http://www.pcgamer.com/grab-a-free-steam-key-for-tactical-mech-game-bionic-dues/

I'll be honest, I was originally just going to idle in it for the cards, but it has a surprising amount of customization and meta in it. Give it a shot, guys!