Cast a random Lesson spell without paying its mana color. If that spell has X in its mana cost, X is 3. (As of today, there are 20 lessons. Perhaps look up a list and roll a d20?)
Near Mint - $12.50
Lightly Played - $10.00
Moderately Played - $8.70
Heavily Played - $7.50
Damaged - $6.30
Near Mint Spanish - $12.50
Lightly Played Spanish - $10.00
Moderately Played Spanish - $8.70
Heavily Played Spanish - $7.50
Damaged Spanish - $6.30