
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."
Crystalline Nautilus has 1 printing, first in Journey into Nyx (2014). EDHREC ranks it #27,253 among Commander cards. It has 9 official rulings.
Cards that show up in the same decks on EDHREC.