Found that this card isnt working at all.
I'll get a replay if its absolutely needed but the way it turned out is pretty simple.
My Stardust Dragon was attacked and destroyed by battle and sent to the graveyard. I had Shadow Impulse face-down, waiting to use it on Beelze, King of Dark Dragons, Stardust Spark Dragon, or Scrap Dragon. I didn't even get the option to use it.