Because of Molten and Mountain giants. As well as Defender of Argus + Sunfury Protectors to Ancient Watchers/Twilight Drake/Giants, so the Black Knight should be really useful especially when they're close to lethal, your Black Knight comes into HUGE play here. If they do manage to survive til turn 9, you may even have to remove their Alextrasza.
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http://www.hearthpwn.com/decks/91682-sword-of-naxxramas
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Because of Molten and Mountain giants. As well as Defender of Argus + Sunfury Protectors to Ancient Watchers/Twilight Drake/Giants, so the Black Knight should be really useful especially when they're close to lethal, your Black Knight comes into HUGE play here. If they do manage to survive til turn 9, you may even have to remove their Alextrasza.