Crystalline Nautilus [Journey into Nyx]

Set: Journey into Nyx Type: Enchantment Creature — Nautilus Rarity: Uncommon Cost: {2}{U} 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."