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 - $19.80
Lightly Played - $15.90
Moderately Played - $13.90
Heavily Played - $11.90
Damaged - $9.90
Near Mint Spanish - $19.80
Lightly Played Spanish - $15.90
Moderately Played Spanish - $13.90
Heavily Played Spanish - $11.90
Damaged Spanish - $9.90