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 - $2.00
Lightly Played - $1.80
Moderately Played - $1.60
Heavily Played - $1.40
Damaged - $1.00
NM-Mint Non English - $2.00
Lightly Played Non English - $1.80
Moderately Played Non English - $1.60
Heavily Played Non English - $1.40
Damaged Non English - $1.00
Foil Prices
NM-Mint Foil - $7.70
Lightly Played Foil - $7.00
Moderately Played Foil - $6.20
Heavily Played Foil - $5.40
Damaged Foil - $3.90
NM-Mint Foil Non English - $7.70
Lightly Played Foil Non English - $7.00
Moderately Played Foil Non English - $6.20
Heavily Played Foil Non English - $5.40
Damaged Foil Non English - $3.90