|Effect||Play this card only if your opponent has at most 12 health. Win the fight|
This card is really bad near the end of the game so you should only take it if you are a Monk and can delete it later.
As is clear from the card text, you can't even play Execute when the enemy has more than 12 health. If you circumvent this limitation (with Desperate Strike), Execute will be played but still have no effect.