Ricochet.

Not only because this card easily slots into many decks, but because the art and the text, which are totally lovely, depict hexslingin'.
Maybe this card could have two alt-art versions - one depicting bullets bouncing off gadgets (exoskeletons, force fields, hydro-punchers...), and another depicting bullets bending around blessed (shield of faith, dumbstruck, righteous fury...).
Cheers.