Do you know what is Cryptoskulls? It is collectibke ERC-721 token that can be stored on Eth. Blockchain. This is quite different which are you looking. It is an investment crypto collection of 10,000 unique skulls. When you go to the market and purchasing CryptoSkull token. It will randomly selected. Its emission is nit limited.
There are three digital marketplace for this token.
SKULLS — name of a coin in Minter blockchain. You can use SKULLS for buying and selling CryptoSkull tokens and as an in-game currency in our own and partner projects.
Source
You can easily join the platform on https://cryptoskulls.com. you can find some more amazing things here like Each CryptoSkull character is a unique pixel art.
This property shows total rareness of all image features. CryptoSkulls with rarer features have less Uniqueness Index.