I have defeated the lich king with all 9 classes. Here is the decklist so that you can do it as well! Hope this helps!
PS: Copy this: AAEBAaToAgTgBYQXscIChsQCDbsDxQPbA/4D4wWvB9AH+AenCNOqAtO8ArPBAp3CAgA=
and then create a deck. It will ask you if you'd like to automatically build it. Happy hunting!

Custom Paladin2

Class: Paladin

Format: Wild

2x (1) Grimscale Chum

2x (1) Grimscale Oracle

2x (1) Hungry Crab

2x (1) Murloc Tidecaller

1x (1) Sir Finley Mrrgglton

2x (1) Vilefin Inquisitor

2x (2) Bluegill Warrior

2x (2) Hydrologist

2x (2) Murloc Tidehunter

2x (2) Rockpool Hunter

2x (3) Coldlight Oracle

2x (3) Coldlight Seer

2x (3) Murloc Warleader

1x (3) Primalfin Lookout

2x (4) Blessing of Kings

1x (4) Gentle Megasaur

1x (4) Old Murk-Eye

AAEBAaToAgTgBYQXscIChsQCDbsDxQPbA/4D4wWvB9AH+AenCNOqAtO8ArPBAp3CAgA=

To use this deck, copy it to your clipboard and create a new deck in Hearthstone