Bestow ![3](/Handlers/Image.ashx?size=small&name=3&type=symbol)
![Blue](/Handlers/Image.ashx?size=small&name=U&type=symbol)
(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."