Hearthpwn

Just felt like making some cards, decided to make one for each Naxx boss. 


Anub'Rekhan - 8

Battle Cry - Silence each enemy minion, and create two 3/3 Crypt Lord tokens with taunt.

6/6



Grand Widow Faerlina - 6

A player may destroy one of their mana crystals to give this -6/-0 until their next turn.

8/4


Maexxna - 8

Battle Cry - Your opponent can't cast spells or attack on their next turn.

6/6




Noth, the Plaguebringer - 4

~ can't attack. At the end of each turn, summon a random skeleton minion. (ranging from 1/1 to 4/4)

3/3



Heigan the Unclean - 6

At the end of each opponent's turn, cause a 50% chance for each minion for that minion to take 4 damage.

3/6




Loatheb - 6

Characters can't be healed or dispelled.

5/4



Instructor Razuvious - 4

Battle Cry - Opponent gets 4 0/5 minions with taunt.

5/5



Gothik the Harvester - 3

Adjacent allies can't be attacked. 

2/4



Patchwerk - 8

Patchwerk attacks each opposing character instead of one.

8/8


Grobbulus - 5

Taunt, Death Rattle - each character gains Death Rattle - Summon a 2/2 Ooze

3/4


Gluth - 6

Charge, At your end step, summon 3 1/1 Zombie Chow. At the beginning of your turn, destroy all chow and Gluth gains 4hp per each destroyed.

3/4


Thaddius - 6

Overload 6, Spells opponents play have overload 4

8/8




Sapphiron - 12

Costs 2 less for each Legendary undead you control. 

Battle cry: Freeze all opposing minions

8/8


Kel'Thuzad - 10

Battle Cry - Draw 5 cards.
Death Rattle - Shuffle ~ into your deck

5/5

You seemed to have thought these through, nice ideas in here but they would need lot of balance as it looks very op from where I stand

Four Horsemen would be hard to incorporate while achieving the flavor of the fight and maintaining balance, but here it goes...

Baron Rivendare - 10

Battlecry - Summon the horsemen.

Battlecry - Unholy Shadow - Reduce a target's health by 2.

2/3

Thane Korth'azz - 0

Battlecry - Meteor - Deals 4 damage split evenly (as possible) between all enemy targets

2/3

Lady Blameux - 0

Battlecry - Voidzone - Randomly deal 1 damage to an enemy and any adjacent allies.

Deal 2 damage to a random enemy every turn.

0/3

Sir Zeliek - 0

Battlecry - Holy Wrath - Deal 2 damage to a target, 50% chance to damage an adjacent target for 2 damage.

Deal 2 damage to a random enemy every turn.

0/3

Its probably a bit OP, but I'd argue that its easier to deal with (initially) than Deathwing.

I meant to put Mr Bigglesworth and 4horsemen, I copied the ideas from my phone and forgot to add them. 

Mr. Bigglesworth was similar to what you posted:


Mr Bigglesworth - 2

Death Rattle - Kel'Thuzad costs 2 less to play this turn.

0/1



4 Horsemen was like this:


The Four Horsemen - 10

(Spell)

Call forth the four horsemen! The four horsemen of Naxxramas share a health pool and can only be damaged once by each spell.


Thane Kor'thazz

Taunt

Death Rattle - deal 9 damage divided evenly among all opponent's minions.


3/11


Baron Rivendare

Charge, ~ can only attack the target with the least health.

5/11



Lady Blameaux

~ is immune while attacking. 

When ~ attacks a target, dispel it.

3/11



Sir Zeliek

~ can't attack. At the beginning of your turn, ~ does 1, 2 and 3, damage to 3 random enemy minions.

1/11