Death's Door

Death's Door is an uncommon Necrobinder skill costing 1 Energy that gains 6 Block, and if you applied Doom this turn, gains Block 2 additional times for a total of 18 Block. This conditional triple Block makes Death's Door extremely efficient in Doom-heavy builds where Doom is applied frequently.

Death's Door pairs naturally with Blight Strike, which applies Doom as part of its attack to enable the triple Block. Borrowed Time's self-Doom application also satisfies the condition. Oblivion guarantees Doom application on any card play, and Shroud provides additional Block alongside Death's Door's large Block value.

In the Necrobinder Doom archetype, Death's Door is the premier defensive card that rewards Doom-focused play with enormous Block. Against heavy-hitting bosses like Lagavulin Matriarch and Ceremonial Beast, 18 Block for 1 Energy is exceptional value that lets you build Doom stacks while staying alive. The condition is trivially met in any deck running Blight Strike or Borrowed Time.