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 - $3.50
Lightly Played - $3.30
Moderately Played - $3.10
Heavily Played - $2.80
Damaged - $2.30
NM-Mint Non English - $3.50
Lightly Played Non English - $3.30
Moderately Played Non English - $3.10
Heavily Played Non English - $2.80
Damaged Non English - $2.30
Foil Prices
NM-Mint Foil - $11.70
Lightly Played Foil - $11.10
Moderately Played Foil - $10.50
Heavily Played Foil - $9.40
Damaged Foil - $7.60
NM-Mint Foil Non English - $11.70
Lightly Played Foil Non English - $11.10
Moderately Played Foil Non English - $10.50
Heavily Played Foil Non English - $9.40
Damaged Foil Non English - $7.60