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 - $2.50
Lightly Played - $2.30
Played - $1.80
Heavily Played - $1.50
Damaged - $1.30
Near Mint Non-English - $2.50
Lightly Played Non-English - $2.30
Played Non-English - $1.80
Heavily Played Non-English - $1.50
Damaged Non-English - $1.30
Foil Prices
Near Mint Foil - $6.90
Lightly Played Foil - $6.20
Played Foil - $4.90
Heavily Played Foil - $4.20
Damaged Foil - $3.50
Near Mint Foil Non-English - $6.90
Lightly Played Foil Non-English - $6.20
Played Foil Non-English - $4.90
Heavily Played Foil Non-English - $4.20
Damaged Foil Non-English - $3.50