This has always been a strange card for a couple of reasons.
I've been playing Hearthstone since beta and I didn't know about this card until a couple of months ago. I finally came across this card myself during Tavern Brawl. There are probably many players who've been playing for a long time. Who don't know this card exists today.
I do understand why it's in the game. It's so the player doesn't think that Mindgames bugged or glitched out. However, it would destroy it's self after the end of your turn. This didn't make much sense as the description for the card read "Mindgames whiffed! Your opponent had no minions!"
It didn't state that the card would destroy it's self after the end of your turn. However, if you silenced the card it wouldn't be destroyed. The card can then be buffed as normal.
However, this has been changed quite recently. The card no longer destroys it's self after the end of your turn.
So it got me thinking. I wonder what a Golden Shadow of Nothing card looks like. Had a look on youtube and couldn't find anything. So I crafted a Golden Mindgames (1600 dust down the drain!). To find out and here's the video. This video also contains the attack sound for Shadow of Nothing too.