I like this card, has a nice mechanism to it.However, IMO, to make it more like, I suggest that it could also absorb other creatures's damage by reducing its attack.Blade Guard sounds more like to me, but its just a suggestion.
What I meant is that probably the name of the creature should change, not so the element.The reason why I suggested to change the mechanism a bit is because of the character of , they help each other. If you see my Sigil Series, they all have the characteristic of their own precise element.
Note that Overdrive will lobotomize Crisis.It's in the notes.Another good name for the upped could be Feudal Knight.