When Chthonian Nightmare enters the battlefield, you get EEE.
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 - $3,300
Lightly Played - $2,600
Moderately Played - $2,300
Heavily Played - $2,000
Damaged - $1,700
Near Mint Spanish - $3,300
Lightly Played Spanish - $2,600
Moderately Played Spanish - $2,300
Heavily Played Spanish - $2,000
Damaged Spanish - $1,700
Foil Prices
Near Mint Foil - $8,600
Lightly Played Foil - $6,900
Moderately Played Foil - $6,000
Heavily Played Foil - $5,200
Damaged Foil - $4,300
Near Mint Foil Spanish - $8,600
Lightly Played Foil Spanish - $6,900
Moderately Played Foil Spanish - $6,000
Heavily Played Foil Spanish - $5,200
Damaged Foil Spanish - $4,300