you need six empty deck slots for this new Lich King expansion. Three Death Knight decks come from buying the Path of Anthas card packs (I paid 2000 gold for normal) and they appear at the end of your collection.
Three more Anthas decks appear at the start of your collection after you complete the four-game prologue.
In case you didn’t have six slots free when you did this, here are the deck codes to copy to catch you up.
Anthas Frost
Arthas Frost
Class: Death Knight
Format: Standard
Year of the Hydra
2x (0) Horn of Winter
2x (1) Bone Breaker
2x (1) Icy Touch
2x (1) Ymirjar Frostbreaker
2x (2) Deathchiller
2x (2) Frost Strike
2x (2) Harbinger of Winter
2x (3) Glacial Advance
2x (3) Howling Blast
1x (3) Rimefang Sword
1x (4) Lady Deathwhisper
2x (4) Might of Menethil
2x (4) Remorseless Winter
1x (4) Thassarian
2x (6) Marrow Manipulator
1x (6) Overseer Frigidara
2x (7) Frostwyrm’s Fury
AAECAfHhBASJ9gTE9gTLpQXMpQUN7eME9eME/uMEguQEk+QEueYEjvEEiPYEtvcEqYAFtIAFtYAFk4EFAA==
To use this deck, copy it to your clipboard and create a new deck in Hearthstone
Anthas Blood
Arthas Blood
Class: Death Knight
Format: Standard
Year of the Hydra
2x (1) Body Bagger
1x (1) Skeletal Sidekick
2x (2) Blood Tap
2x (2) Hematurge
2x (2) Plague Strike
2x (2) Vicious Bloodworm
2x (3) Anti-Magic Shell
2x (3) Asphyxiate
2x (3) Chillfallen Baron
2x (3) Darkfallen Neophyte
2x (4) Malignant Horror
2x (4) Nerubian Swarmguard
2x (5) Blood Boil
1x (5) Deathbringer Saurfang
2x (6) Gnome Muncher
1x (7) Frostmourne
1x (7) Patchwerk
AAECAfHhBATZ4gSJ5gS05gSuoQUN8OMEhuQEkuQElOQEj+0Eh/YEl/YEmPYEsvcEs/cEtvoEuf8EmYEFAA==
To use this deck, copy it to your clipboard and create a new deck in Hearthstone
Anthas Unholy
Arthas Unholy
Class: Death Knight
Format: Standard
Year of the Hydra
2x (1) Body Bagger
2x (1) Plagued Grain
2x (2) Battlefield Necromancer
2x (2) Dark Transformation
2x (2) Plague Strike
1x (3) Anti-Magic Shell
2x (3) Chillfallen Baron
2x (3) Graveyard Shift
2x (3) Unholy Frenzy
1x (4) Grave Strength
2x (4) Malignant Horror
2x (4) Tomb Guardians
2x (5) Army of the Dead
2x (5) Corpse Bride
1x (8) Lord Marrowgar
1x (9) The Scourge
2x (10) Stitched Giant
AAECAfHhBASG5AT47ATa8QSF9gQN8OME/+MEjOQEjeQEkOQEkeQE1fEEgfYEh/YEsvcEtPcEmIEFmYEFAA==
To use this deck, copy it to your clipboard and create a new deck in Hearthstone
and on buying the Anthas cards (I paid 2000 gold for normal)
Death Knight 1
Death Knight
Class: Death Knight
Format: Standard
Year of the Hydra
2x (1) Body Bagger
2x (1) Heart Strike
2x (1) Noxious Cadaver
2x (1) Runeforging
1x (1) Skeletal Sidekick
2x (2) Defrost
2x (2) Obliterate
2x (3) Chillfallen Baron
2x (3) Tar Creeper
2x (4) Death Strike
2x (4) Remorseless Winter
1x (4) Thassarian
1x (5) Deathbringer Saurfang
2x (5) Rime Sculptor
2x (6) Corrupted Ashbringer
2x (6) Gnome Muncher
1x (7) Patchwerk
AAECAfHhBASJ5gS05gSuoQXLpQUNn9QE9OME/OMEleQEseYE0e0Eh/YEiPYE4PYEsvcEs/cEqIEFxIEFAA==
To use this deck, copy it to your clipboard and create a new deck in Hearthstone
Death Knight 2
Death Knight
Class: Death Knight
Format: Standard
Year of the Hydra
2x (1) Body Bagger
2x (1) Heart Strike
2x (1) Runeforging
2x (2) Defrost
2x (2) Frost Strike
2x (2) Harbinger of Winter
2x (3) Acolyte of Pain
2x (3) Chillfallen Baron
2x (3) Rimefang Sword
2x (4) Death Strike
2x (4) Remorseless Winter
2x (4) Repulsive Gargantuan
1x (4) Thassarian
2x (5) Rime Sculptor
2x (6) Gnome Muncher
1x (7) Patchwerk
AAECAfHhBAKJ5gTLpQUOnNQE9OME9eME/OME0e0ElfEEh/YEiPYEifYE4PYEsvcEs/cEtIAFxIEFAA==
To use this deck, copy it to your clipboard and create a new deck in Hearthstone
Death Knight 3
Death Knight
Class: Death Knight
Format: Standard
Year of the Hydra
2x (1) Body Bagger
2x (1) Plagued Grain
2x (1) Skeletal Sidekick
2x (2) Battlefield Necromancer
2x (2) Bonedigger Geist
1x (2) Murloc Tidehunter
2x (3) Anti-Magic Shell
2x (3) Chillfallen Baron
2x (3) Graveyard Shift
2x (3) Ymirjar Deathbringer
2x (4) Grave Strength
2x (4) Grim Necromancer
2x (5) Army of the Dead
2x (5) Possessifier
1x (8) Lord Marrowgar
2x (10) Stitched Giant
AAECAfHhBAK1nwT47AQO2aAE/+MEhuQEkOQEkeQEqeYEgfYEhfYEh/YEsvcEmIEF3YIFrqEFz6UFAA==