Damage Mage is nice card which works directly from your hand to prevent you from taking extra damage through summoning itself to field and gaining  point equal to  the one you just lost  and you can use it in deck  that  make  its effect through taking damage or opponent deck  using effect damage technique like  elemental Hero Wingman effect or double sword technique or  back fire  So next time don't forget damage Mage and you can add your hand by sangan