Valkyrie the Berserker

This deck leans into Valkyrie's specialty, which is mowing down minions with brutal efficiency. Prioritize getting Dragonfang, Valhalla, Combat Specialist, and Fluid Motion into play. Use Deathglow as much as possible. Don't bother defending unless up against a particularly hard-hitting opponent, in hopes that you can start your turn untapped. If you simply must tap to defend, hopefully you can start up your attacks with either Quick Strike or Have at Thee! Ideally you want to team up with a hero who can sometimes get you an extra card, via Avengers Mansion.