I just ask it cuz it crossed my mind, does not make a huge difference anyway...wouldn't this make more sense in ? It's an assassin's weapon after all, if I understand the flavour correctly...
How about making it spawn a stack of two "glass shard" cards, each lasting a turn? If not, it's still great as is, my only worry would be copyright if that name appears only in starwars.
I really like the card. Is it in Crucible yet?
The only thing I'd change is not spawning shards when stolen, because flavour (the dagger is still intact).