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 - $21.60
Lightly Played - $17.30
Moderately Played - $15.10
Heavily Played - $13.00
Damaged - $10.80
Near Mint Spanish - $21.60
Lightly Played Spanish - $17.30
Moderately Played Spanish - $15.10
Heavily Played Spanish - $13.00
Damaged Spanish - $10.80
Foil Prices
Near Mint Foil - $31.50
Lightly Played Foil - $25.20
Moderately Played Foil - $22.10
Heavily Played Foil - $18.90
Damaged Foil - $15.80
Near Mint Foil Spanish - $31.50
Lightly Played Foil Spanish - $25.20
Moderately Played Foil Spanish - $22.10
Heavily Played Foil Spanish - $18.90
Damaged Foil Spanish - $15.80