As fans of Blizzard's popular card game, Hearthstone are aware the single-player adventure expansion Curse of Naxxramas is due to be released within 4 days. With the expansion comes a five-part campaign to play including bosses to fight. There will also be new cards added to the game, more than 30. Some of them have actually been revealed ahead of the beginning of the month-long release event. Here they are:

Minion, 1 mana cost, 1 attack and 2 health. Gains +1/+1 for every summoned minion with Deathrattle.

Minion, 3 mana cost, 4 attack and 4 health. Deathrattle: Upon death allows your opponent to draw a card.

Minion, 2 mana cost, 0 attack and 2 health. Deathrattle: Summons a Nerubian with four attack and four health.

Legendary minion, 4 mana cost, 1 attack and 7 health. Allows all minions to trigger Deathrattle abilities twice.

Minion, 3 mana cost, 2 attack and 2 health. Stealth, gains +1/+1 at the start of your turn.

Minion, 5 mana cost, 5 attack and 5 health. Battlecry: Enemy spells cost 5 mana more next turn.

Spell, 4 mana cost. Destroys all minions and summons 2/2 Treants to replace them.

Weapon, 4 mana cost, 4 attack and 2 durability. Deathrattle: Deals 1 damage to all minions.

Secret, 1 mana cost. When a minion dies, give another friendly minion +3/+2.

Minion, 4 mana cost, 5 attack and 5 health. Deathrattle: Return a friendly minion to your hand.

Spell, 2 mana cost. Destroy a minion then return it to life with full health.

Secret, 3 mana cost. When a friendly minion dies, you can put two copies of it in your hand.

Minion, 3 mana cost, 3 attack and 4 health. Deathrattle: Gives a friendly minion +3 health.

Demon minion, 3 mana cost, 3 attack and 4 health. Deathrattle: Put a Demon from your hand onto the Battlefield.

Beast minion, 1 mana cost, 1 attack and 1 health. Deathrattle: Draw a random Beast card.