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If sacrifice a enchanted creature by Cavalier of Night's ETB ability,
-That creature does not sacrificed.
--Stop mark? display on it.
--It can attack or block.
--It can't be targeted or destroyed.

-That aura put into graveyard.

(Attachment unrelated...)

I can't duplicate either in dev or release, but if player sacrifices a creature and opponent has no creatures to target, then the sacrificed creature stays around with the interdictory symbol and its associated baggage.

Fixed in 21fa894 in fact in commit 37f5c9e.