Crystalline Nautilus

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.)
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."

4/4

Collection:

Journey into Nyx

Rarity:

Uncommon