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.
NM-Mint - $29.30
Lightly Played - $27.80
Moderately Played - $26.40
Heavily Played - $23.40
Damaged - $19.10
NM-Mint Non English - $29.30
Lightly Played Non English - $27.80
Moderately Played Non English - $26.40
Heavily Played Non English - $23.40
Damaged Non English - $19.10
Foil Prices
NM-Mint Foil - $55.00
Lightly Played Foil - $52.30
Moderately Played Foil - $49.50
Heavily Played Foil - $44.00
Damaged Foil - $35.80
NM-Mint Foil Non English - $55.00
Lightly Played Foil Non English - $52.30
Moderately Played Foil Non English - $49.50
Heavily Played Foil Non English - $44.00
Damaged Foil Non English - $35.80