Bundle Stars and PCgamer are giving away 200,000 Steam keys for Grimoire: Manastorm. It's an Early Access wizard-'em-up—a first-person 'shooter' with devastating magic taking the place of bullets or grenades.
Grimoire: Manastorm lets you pick from a pool of six wizard classes, and wield spells inspired from Dota 2 and League of Legends. It's been favourable reviewed by Steam users, and will be further added to with patches and updates as developer Omniconnection continues to expand the game.