Marcus, Painter of the Moon

As Marcus, Painter of the Moon enters the battlefield, choose a color.
All cards that aren't on the battlefield, spells, and permanents are the chosen color in addition to their other colors.
Nonbasic lands are Plains if the chosen color is white, Islands if the chosen color is blue, Swamps if the chosen color is black, Moutains if the chosen color is red and Forests if the chosen color is green.
{w}{u}{b}{r}{g}: Gain 0 life.