This looks really neat! I've yet to try it, but seems fun :)

One note, though. "Cold Blood" is pretty explicitly overpowered, tbh. It's explicitly better than Inflame (the Ironclad power that gives +2 Strength) in that it can conditionally give another +2 strength. The thing is, Inflame itself would be outright overpowered as a Silent card. Because of how Silent is built/balanced- with many more free or multihitting attacks than Irconclad- Strength as a stat is far stronger per-point e.g. a Strength potion is way more exciting on Silent than on Ironclad. I might take this power, if it read, say, "Gain 1 strength. Combo 3: Gain an additional 2 strength." It wouldn't be an autopick, though. As-is, unless I'm going a purely poison based build on Silent, I would take this card in literally every single deck it was offered to me in. (Also, unless I'm missing something, you don't need to put 'Exhaust' on a Power card?)

(Most of what you've made is really cool, though!)