From what I understand Silence removes all extra effects and buffs on a card, so it should lose its deathrattle effect. Now even if you can't silence your own minion (which im pretty sure you should be able too) it might force your opponent to use a different kind of removal. Overall he just looks like a really solid 6 drop haha
Yes you can silence your own minions to remove unwanted effects. I mostly use on my gadgetzen auctineer when I have too many spells and too many cards in my hand and I don't want to discard newly drawn cards.