This is the new Purify HS Priest Card being released as part of the new adventure One Night in Karazhan.
The card reads: Silence a friendly Minion. Draw a card.
This is a decent card and reasonably costed. Drawing a card for 2-mana is fine, and silencing one of your own minions can work out well if you build your deck to include some powerful cards that have a downside, but you can silence it.