If you want to know how to get HS card Silvermoon Portal for the Paladin class, you need to complete the class challenges for week two of One Night in Karazhan. These are The Opera class challenges, there is a Paladin and Warlock challenge, and don’t panic – they are super easy.
With Class Challenges you are given pre-made decks displaying some of the new cards and have to beat one of the bosses.
The card reads: Give a minion +2/+2. Summon a random 2-Cost minion.
I think this will see some play in some aggro decks. A 2/2 buff is decent, and a random 2 cost minion is pretty good value.