Bestow {3}{U}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.) When Crystalline Nautilus becomes the target of a spell or ability, sacrifice it. Enchanted creature gets +4/+4 and has "When this creature becomes the target of a spell or ability, sacrifice it."
Near Mint - $100
Lightly Played - $100
Moderately Played - $100
Heavily Played - $100
Damaged - $100
Near Mint Spanish - $100
Lightly Played Spanish - $100
Moderately Played Spanish - $100
Heavily Played Spanish - $100
Damaged Spanish - $100
Foil Prices
Near Mint Foil - $700
Lightly Played Foil - $600
Moderately Played Foil - $500
Heavily Played Foil - $400
Damaged Foil - $400
Near Mint Foil Spanish - $700
Lightly Played Foil Spanish - $600
Moderately Played Foil Spanish - $500
Heavily Played Foil Spanish - $400
Damaged Foil Spanish - $400