River of the Dead

River of the Dead enters tapped and does not untap during your next untap step. When it enters the battlefield, Discover {4}.

{t}: Add {b} or {w}.
{2}, {t}: Target non-legendary creature gains Lifelink until the end of the turn.
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Oaths made by the River of the Dead are especially binding, bringing a fate worse than death to those that break them.