Profiteering Patron

Artifacts you control have "{t} : Add one
mana of any color. Spend this mana only to cast an instant or sorcery spell."
Exhibit {4}{u} ( {4}{u}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a colourless artifact with no other card types and no mana cost. Exhibit only as a sorcery.)