Type

Enchantment Creature — Nautilus

Oracle Text

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.)\nWhen this permanent becomes the target of a spell or ability, sacrifice it.\nEnchanted creature gets +4/+4 and has "When this creature becomes the target of a spell or ability, sacrifice it."