Forum:Lightsworn Q

I have some question about lightsworn

-If I tribute lightsworn for Celestia, Lightsworn Angel i can use her effect once time or many times? and can i send 8,12 top cards of my deck to destroy 4,6 card my opponent control?

-If i have Aurkus, Lightsworn Druid my lightrsworn can not use Lightsworn Sabre right?

-Judgment Dragon is lightsworn or not?

THX!!