The latest Curse of Naxxramas card has been revealed, and the death effect stacking continues with Duplicate, a new Mage card! Also check out the Shaman card Rebirth if you haven't seen it!

Duplicate - Mage Card from Curse of Naxxramas Reincarnation (Rebirth renamed) - Shaman Card from Curse of Naxxramas


And here's a list of all the cards revealed so far:   Tip: Click the image to view a larger version where you can page between them all!
Baron Rivendare - Neutral Legendary Card from Curse of NaxxramasDancing Swords - Neutral Card from Curse of NaxxramasNerubian Egg - Neutral Card from Curse of NaxxramasShade of Naxxramas - Neutral Card from Curse of NaxxramasUndertaker - Neutral Card from Curse of Naxxramas

Neutral

Poison Seeds - Druid Card from Curse of Naxxramas

Druid

Duplicate - Mage Card from Curse of Naxxramas

Mage

Anub'ar Ambusher - Rogue Card from Curse of Naxxramas

Rogue

Avenge - Paladin Card from Curse of Naxxramas

Paladin

Reincarnation (Rebirth renamed) - Shaman Card from Curse of Naxxramas

Shaman

Death's Bite - Warrior Weapon Card from Curse of Naxxramas

Warrior

Be sure to check out Blizzard's preview of the Curse of Naxxramas adventure for more details on how the mode works, or Wowhead's page on the Naxxramas raid for a look at the original.