The owner of this deck hasn't added a sideboard, they probably should...
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This deck comes from MTGSalvation's Halloween article. I transcribed the list here so I could more easily share the idea and quickly search for other cards to add to the sideboard.
Get Dark Depths onto the field and either:1. use the interaction of Vampire Hexmage to summon Marit Lage2. use Thespian's Stage to become a copy of Dark Depths—with no counters—to summon Marit LageBask in the glory of the Old One as he wreaks havoc upon your opponents.
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