A self-cycling auto-damage card that's the perfect way to kill off that last bit of HP your weapon didn't already finish or to end a Switchblade frenzy that didn't quite net all the damage you needed. It's a little expensive but Auto-damage should be!
There is a downside, if you run around toting 4+ actions in a turn, this thing will put a clear damper on that. Even if you just start a round engaged with a 3hp foe and hit them once for 2 damage to finish them with Coup de Grâce then you're loosing an action, this lone disadvantage is I think going to be common enough to put some people off this card.
I personally am excited for the possibility of playing this with an Ornate bow as a way to finish 4hp foes!