If I send a Night Assaliant to the Graveyard by TIV's effect and there is Night Assaliant in the Graveyard already can I send that Night Assaliant back to my hand and send it back to the Graveyard by TIV's effect (If appropriate) and get back the Night Assaliant in my graveyard, etc etc? My friend says I can't but I'm not sure. Can someone clear this up for me?