Klaus is used in a variety of decks especially Beast themed, rush, and midrange. If a lane is empty, Klaus can be 8 damage for 3 cost, and this can be further amplified by cards that further increase her attack such as General Hardy, Elf War Priest, and the Warrior's longsword. Klaus can also take care of threats by taking up quite a little space for a lot of damage and little mana.
Full Art Edit
August 5, 2015: Now an Archive Prize