The owner of this deck hasn't added a sideboard, they probably should...
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I'll first admit that when the Proliferate mechanic first arrived, I thought 'great, something that can find use in just about ANY deck...' and now, I think I took a good idea and dilapidated it by piling together a bunch of cards that I thought would work. Seeing as how this is 'barely' a UB deck, other colors are as helpful a suggestion as any. I REALLY like the idea of proliferating vivid lands, maybe even a Ley Druid to help them along?
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