This is the Ironforge Portal HS Warrior Card that’s part of the upcoming set of cards to be released with the new Hearthstone adventure One Night in Karazhan.
It follows the theme with Firelands Portal for Mage, and Moonglade Portal for Druid, and costs 5 mana to: Gain 4 Armor. Summon a random 4-Cost minion.
All of the portal cards look really strong and I can see this being played instead of Shield Block, or in a tempo warrior/control warrior deck. There are going to be some interesting minions summoned, there are lots of 4-cost minions. It will be even stronger in Wild Format too.