Crystalline Nautilus {2}{U}

Enchantment Creature — Nautilus

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.)

When this permanent 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."

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