Crypto hasn't solved the digital scarcity issue at all. If the game stops existing so do the servers hosting the assets, since most crypto systems can only hold small tokens rather than the assets themselves. There are plenty of NFT examples where the underlying company went broke and the assets themselves disappeared from the internet. The MTG example falls flat if Wizards (the owners) take down their asset hosting services, so it's still mostly centralized and dependent on a company to function.
I believe this depends on the location of hosting. One version is that things are hosted by URI on wizards.com. Another is the data being stored on something content-addressable like IPFS where anyone with the content can verifiably attest to both ownership (b/c it's on the block chain) and that this is the real thing (b/c the content hashes match).
Plus even if you have the assets themselves they're likely useless without the game's original proprietary software for interpreting them.