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Each card has a specific rarity symbol in the lower right corner

I prefer it in decks with ways to flicker or sacrifice this red artifact to cards other than its own ability

In the earlier stages, it grabs mana dorks or utility pieces

(Activate each exhaust ability only once.) The trigger from Jeong Jeong's exhaust ability and the copy it creates both resolve before the spell that caused the ability to trigger

Since your mana is refunded as Treasure Tokens, you can even view the card as temporary ramp

Getting a board full of demons isn't too hard, and drawing cards at the cost of life based on the number of demons you control is the most black-mana ability I've ever heard of