Kel'Thuzad by pandahero

Tier 1
Devour - Bonus damage now applies to mercenaries.
Sacrifice - Skeletons last 100% longer.
Sacrifice - Skeletons have 50% more health.
Bribe
Demolitionist
Conjurer's Pursuit

Tier 2
Frost Blast - Increase radius by 20%.
Devour - Increase AoE by 30%.
Frost Blast - non-Heroes including buildings and bosses not only take damage but are also frozen stunned for 3 seconds.
Detonate Mana - Increase radius by 50%.
Sacrifice - Cooldown reduced by 3 seconds.
Envenom

Tier 3
Frost Armor - Enemy heroes that attack you are chilled. Additionally, every 8 seconds you can block the next basic attack from an enemy hero reducing its damage by 25%.
Frost Bolt - Each attack slows the movement speed by 50% for 5 seconds.
Death Touch
Mercenary Lord
Battle Momentum

Tier 4
Death and Decay - 
Shadow Fissure - 

Tier 5
Sacrifice - Additional skeletal mage is spawned. 
Sacrifice - Skeletons now gives 2 Mana each upon death.
Detonate Mana - Increase to 30%.
Frost Blast - Triggers a second blast after 2 seconds delay.
Giant Killer
Sprint

Tier 6
Detonate Mana - Silences the primary target for 3 seconds.
Frost Blast - Cooldown reduced by 2 seconds.
Devour - Increase the damage bonus to 300%.
Blood for Blood
Stone Skin
Executioner

Tier 7
Death and Decay - Intensifies 2% per second. Cooldown reduced to 60 seconds.
Shadow Fissure - Delay reduced to 1 second. Global AoE like Diablo's Heroic.
Bolt of the Storm
Fury of the Storm
Nexus Frenzy