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 - $1.80
Lightly Played - $1.40
Moderately Played - $1.30
Heavily Played - $1.10
Damaged - $0.90
Near Mint Spanish - $1.80
Lightly Played Spanish - $1.40
Moderately Played Spanish - $1.30
Heavily Played Spanish - $1.10
Damaged Spanish - $0.90
Foil Prices
Near Mint Foil - $2.00
Lightly Played Foil - $1.60
Moderately Played Foil - $1.40
Heavily Played Foil - $1.20
Damaged Foil - $1.00
Near Mint Foil Spanish - $2.00
Lightly Played Foil Spanish - $1.60
Moderately Played Foil Spanish - $1.40
Heavily Played Foil Spanish - $1.20
Damaged Foil Spanish - $1.00