When Chthonian Nightmare enters the battlefield, you get EEE (three energy counters).
Pay X E, Sacrifice a creature, Return Cthonian Nightmare to its owner's hand: Return target creature card with mana value X from your graveyard to the battlefield. Activate only as a sorcery.
Near Mint - $300
Lightly Played - $300
Moderately Played - $200
Heavily Played - $200
Damaged - $200
Near Mint Spanish - $300
Lightly Played Spanish - $300
Moderately Played Spanish - $200
Heavily Played Spanish - $200
Damaged Spanish - $200
Foil Prices
Near Mint Foil - $800
Lightly Played Foil - $600
Moderately Played Foil - $600
Heavily Played Foil - $500
Damaged Foil - $400
Near Mint Foil Spanish - $800
Lightly Played Foil Spanish - $600
Moderately Played Foil Spanish - $600
Heavily Played Foil Spanish - $500
Damaged Foil Spanish - $400