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[Cardname] is also a Knight and gains vigilance as long as you control a white or black permanent.
{2}{w/b}{w/b},{t}: Search your library for a white or black creature with converted mana cost X or less that shares a creature type with [Cardname] and put it onto the battlefield under your control, where X is the size of your party. Then shuffle your library. If your party size is equal to four or more, sacrifice [Cardname].