How to beat Deathwing / Book of Heroes: Thrall / Hearthstone

Hearthstone
Book of Heroes: Thrall
Deathwing

The player always gets Wild Elemental, Arid Stormer, Rockbiter Weapon on mulligan.

These cards can be replaced with Lava Burst, Stormstrike, Warsong Envoy. The replacement takes place from left to right (i.e., if the player replaced one card, he will receive Lava Burst regardless of whether Wild Elemental or Rockbiter Weapon was replaced).

The player always draws the cards on first eleven turns in next order:
Turn 1 - Alexstrasza
Turn 2 - Rockbiter Weapon
Turn 3 - Marshspawn
Turn 4 - Lightning Storm
Turn 5 - Nozdormu
Turn 6 - Doomhammer
Turn 7 - Feral Spirit
Turn 8 - Stormstrike
Turn 9 - Marshspawn
Turn 10 - Kalecgos
Turn 11 - Ysera

If all copies of the cards above were got on mulligan or drawn earlier using other cards, the player will draw the card that follows the "missing" card in the corresponding turn.

Boss starts with Ultraxion on the board.
After Ultraxion is destroyed, Warmaster Blackhorn and two whelps on either side of it are spawned.
Boss is Immune until Ultraxion and Warmaster Blackhorn are alive.

Boss' Hero Power depends on the current Health.
If it is between 101-200, it uses Phase 1's Hero Power.
If it is between 52-100, it uses Phase 2's.
If it is below 51, it uses Phase 3's.

The battle ends with the player victory when Deathwing's health reaches 10 or less.

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