As an additional cost to cast this spell, sacrifice an artifact. Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle.
Near Mint - $6.50
Lightly Played - $6.25
Moderately Played - $5.25
Heavily Played - $4.00
Damaged - $3.25
Near Mint Non-English - $6.50
Lightly Played Non-English - $6.25
Moderately Played Non-English - $5.25
Heavily Played Non-English - $4.00
Damaged Non-English - $3.25