BEWARE OP is giving his referral link so he can get more points! If you want to join use this link instead http://vyper.io/c/1212 it gets you directly to the giveaway without giving other points.
ALL LINUX USERS
To claim your key, you dont need Razer Cortex for this.
1 - Go to http://www.razerzone.com/razer-id and create a new account
2 - Go to this link to get your Magicka Blade key http://www.razerzone.com/cortex/magicka-wizard-wars-giveaway
3 - Redeem the key & enjoy!