Card Rulings talk:Ocean Dragon Lord - Neo-Daedalus

Me and my friend were wondering, who's effect would come out on top. Could I discard Gravekeeper Watcher to negate and destroy Ocean Dragon Lord - Neo-Daedalus? I was just curious, because I don't know if Sending cards from the hand to the graveyard is the same as Discarding cards? And suggestions? Thanks for the help guys.