I briefly dipped into the Gold III level! Things have certainly gotten harder and I'm noticing that I'm facing people with equivalent level of cards. Most of my commonly used monsters are lvl 3 with a few 2 and 4s. Which is about what I am facing. I have been batting about 50% at this level. I think I'll keep grinding my dailies here and see what happens.
I am getting really tired of facing the life faction right now, seems to be the rage and has a powerful combo. Depending on the rules sometime's I play a counter, other-times if I can't beat 'em I join 'em and play life. For better or worse it certainly feels like I am playing against less bots at this level.
I think I am going to try and start selling some cards I don't use to roll them into buying more packs. We'll see how that goes.