Gandalf, Passing Traveler

Flash, Haste

When Gandalf enters the battlefield, draw a
card if you control only green and white
permanents or if this is the second time this
ability has resolved this turn.

{t}: Target permanent becomes the color or
colors of your choice until end of turn. If that
permanent was all colors, exile Gandalf then
return it to the battlefield under its
owner's control.