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Crystalline Nautilus
Enchantment Creature — Nautilus
Bestow 3 generic mana blue mana blue mana (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."
Rulings (9)
If the enchanted creature leaves the battlefield, the Aura stops being an Aura and remains on the battlefield. Control of that permanent doesn't change; you'll control the resulting enchantment creature.
Apr 26, 2014
Crystalline Nautilus's middle ability functions as long as Crystalline Nautilus is on the battlefield, whether it's a creature or an Aura.
Apr 26, 2014
Auras attached to a creature don't become tapped when the creature becomes tapped. Except in some rare cases, an Aura with bestow remains untapped when it becomes unattached and becomes a creature.
Apr 26, 2014
Legality
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