Neglected Wealth

Whenever you cast a spell you don't own, you may draw two cards. If you do, the owner of the spell investigates. (He or she creates a colorless Clue artifact token with
"{2}, Sacrifice this artifact: Draw a card.")
"Uncovering wealth long lost is satisfying and edifying, but it won't remain a secret!"
- Dike, Fathom Plummeter