And there's loot, too!
"The 11th set in the World of Warcraft TCG, Wrathgate features 220 new cards straight from Northrend and the new Argent Crusade faction. Yes, players can recruit figures from Warcraft lore like Highlord Tirion Fordring for the battle against the Scourge. Also, players can use new Wrathgate crafting materials to forge brand new gear for their TCG heroes.
Each booster pack contains 19 game cards. As with previous sets, players have a chance to open one of three new Loot cards randomly inserted into Wrathgate booster packs. The codes on the Loot cards are redeemed for cosmetic upgrades to World of Warcraft® MMORPG characters. The loot cards in Wrathgate are Landro's Gift, Statue Generator, and Blazing Hippogryph. The latter is another TCG exclusive mount -- a flying hippogryph to set the skies on fire."