ok let me show u the translation of calling nova ...
When this card is destroy as result of battle and sent to Graveyard, you can choose and special summon a Light/Angel
monster from your deck with attack strength of 1500 or less onto your field. When [Sanctuary of Sky] is on the field,
you can special summon an [Airknight - Perseus] instead.
(taken from dmcomet.net)
the picture is like this...apparently it is also called nova summoner