You can upgrade the rarity of your NFTs here! If you want to try to upgrade your NFT, you need to choose NFTs to use for the upgrade More NTFs = higher chances to upgrade.
Be aware that if you fail your upgrade attempt, you will lose half of your used NFTs. If your attempt is successful, then you will get NFTs with better rarity, and all used NFTs will be destroyed.
Upgrading system is under maintenance; please wait until update.
If it fails, 50% of the cards will break