Yin, Stardust

Yin, Stardust cost's {w} less if you control a white
non-land permanent. The same can be said for {2},{u},{b},{r} and {g}.
{w}{x} Gain X Life.
{u}{u}{u}{x} Draw X Cards.
{b}{b}{x}Each player puts the top X cards into their graveyard.
{r}{r}{x}{x}Destroy X lands
{g}{x}Return X permanents from your graveyard
to your hand