A Nomids set contains one trio (a small, a medium, and a large pyramid) of ten different colors and a custom lightning die. To play, each player takes a trio made up of three different colors, with any remaining pyramids forming the bank. In turn, players roll the lightning die, which lets them dump, withdraw, dispense, exchange, or transfer pyramids, moving them between players and the bank.
If a player ends their turn with a monochrome trio, all three pieces of the trio are returned to the bank. If you have no pyramids, even if it's not your turn, you win!