Thrall, Deathseer is a Legendary Shaman card in Hearthstone's Knights of the Frozen Throne expansion. It's a 5 Mana spell that transforms your hero into its undead form and has a Battlecry that transforms your minions into random ones that cost 2 Mana more.
Your Hero Power becomes Transmute Spirit which transforms a friendly minion into a random one that costs 1 Mana more.
Head back to our Knights of the Frozen Throne guide for everything else you could possibly need to know about Hearthstone's sixth expansion!
We will add official artwork for this card as soon as it is revealed by Blizzard