Also probably not even going forward. What prevents me from printing a copy of a card and claiming it's the real card and the one registered on the chain is the forgery?

NFTs for tracking real items is fundamentally flawed as it requires people to perfectly and accurately update the ledger and never feed false information into it. Also how do you crack a pack when they're NFT tracked? The whole economy of TCGs is built around the blind box element of loads of people buying packs of cards.