Mortal Strike is a rare Warrior spell card that belongs to the "Legacy" set. The artist of this card was Zoltan & Gabor, who also made 16 other artworks for Hearthstone.
The flavor text of the card is the following: "If you only use one ability, use Mortal Strike." - The Warrior Code, Line 6
The card is easy to memorize with 94.06% of correct quiz questions.