Your vNFT is NOT able to mine $muse anymore since end of Season 1, but you'll still need to give him gems to keep it alive until Season 2 starts. You can feed it with every gem but it should be an easy decision which gem to choose until Season 2 starts.
Your VNFT is also able to battle, race and even kill or burn other NFTs, but only those who go enough down the rabbit hole know how to play.
Season 1 of the game just ended and with it the $MUSE distribution, $MUSE is now being used for the NFT20 NFT DEX, Season 2 of the game is coming out in a few months
NFT20 is a permissionless p2p protocol to tokenize NFTs and make them tradable on decentralized exchanges such as UniSwap or Sushiswap.
Anyone with an NFT can create a new pool or add his NFT to an existing pool and get ERC20 Token derivatives of their NFTs in a permission-less way, those tokens can be transferred and traded on DEXes right away.