Treasure Map3 Artifact (Rare) 1, Sacrifice Treasure Map: Reveal cards from the top of your library until the combined converted mana cost of those cards is at least 6. Then put those cards into your hand.
Which in a deck with lots of cheap stuff, is kinda sorta potentially ridiculous. Say you have a deck with 2:3 land to nonland ratio (24 land:36 other). So you should hit at least 2 lands. If the majority of your cards cost 1 or 2 this will probably be drawing at least 5 cards. Which is expensive even if it was blue.
Sacrifice a permanent: Put a colorless artifact token named Gold onto the battlefield. It has "Sacrifice this artifact: Add one mana of any color to your mana pool." Any player may activate this ability but only any time he or she could cast a sorcery.
IIW: Heavy Metal