When does "Classic" Dr Strange End.

I have been looking up feats for Dr Strange, but in all the respect threads I can find are Classic feats.

What defines the change from classic to modern

There was no change..classic Strange is the same as the current one.

There wasnt even a retcon?

But yeah, what I mean is , People usually differentiate on the battle forums, how do they do that?

Like if I were to do a debate with Current Strange. I couldnt use classic feats right?

Ive wondered this as well he was much more powerful than he currently is.

I heard somewhere that he got depowered around House of M. Not sure how true that is.

hmm thats pretty recent, I think he did, but he had those powers back at some point IIRC, I think classic was before that.

bump please help

I love Dr. Strange I've read a lot of different stuff here and there but I'm starting to read all his stuff in order now starting with his first appearance in strange tales. Now I personally have NO idea but I want to say maybe after he loses his Sorcerer Supreme title? The title and percs that come with it Eye of Agamotto etc gives him more power. Now if this isn't right I would like to know