Lotus Cobra has an ability that when a land enters the battlefield under your control, you get to add one mana of any color to your mana pool
Personal and Property Risk: Persons in attendance during preview, sale, or removal of goods, assume any and all risks of damage of or loss to person and property, and specifically release the Auctioneer from liability therefore
Most likely, Wizards of the Coast will slowly introduce other Artifact subtypes for flavor reasons, leaving the door open for Artifact typal exploration in a future set
If your deck is based on having the right spell at the right time, you need to have two things
You can, and probably will run your mundane mana rocks, but artifact decks have access to a host of powerful cost reducers that work exceptionally well with broken combo strategies
The newer or more common it is, the greater the chance itll keep its value