This card doesn't really fit together right...
If the idea that you're going for is that the target creature's attack cannot be stopped or reduced, at all, then there's a couple problems. The first being that the name(s) don't fit. Mass and Force really aren't related to this idea. Even ignoring the scientific meaning, the names don't feel right IMO. If you're looking for a science-y type name, then the only name that I can think of is something momentum related, which is obviously already taken. This leads me on to my second problem...
This card is too similar to momentum. It's in the same element and gives the same effect (ignoring shields) but with a kind of half-quint stuck on. Having two cards so close to each other means that either one is going to overshadow the other, or that they'll be so close that we may as well get rid of one. Either way, adding the second card doesn't work. This can be fixed by changing the effect to be different to momentum or by changing the element / thematic in some way. Basically make it different to momentum somehow.
Finally, I don't quite like the weird stat change in the unupped. It's unexplained and unnecessary for me. It just makes the card more obscure and non-fitting. It seems like you needed a way to balance so you just stuck this on. This might not be true, but it's just the way the card feels. Either make it a solid and explainable part of the card (bth upped or unupped) or lose it.
This card can be fixed, I'm pretty sure. I'll leave that up to you if you like.
PS. Proper formatting (and/or grammar) is appreciated.