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No, I'm getting it mixed up. Topdeck was actually in the third game. In the fourth, I just had a creature that removes amulets from the Necromancer. I didn't find a spell that deals 1 damage in my hand, and I managed to win with one hit point because I destroyed his Arthurian Light, leaving him without resources... Although, the topdeck of Cerberus also helped, dealing exactly 12 damage.