Really? Not to be harsh but fairly certain this has been done before and was largely ignored.
Also, all this does is gives you a way to bypass the 6 card limit, albeit you better play damn carefully if you don't want to muck it up.
Sure the mechanic behind it sounds nice but is it really as amazing as many are suggesting? Hell I have a card in my archives with a damn close effect(turns into a copy of the last played card).
Maybe I'm being bitter? Perhaps I'm looking at this wrong, but I really don't get the hype...