Cadreen, Unseen Traveler

Cadreen, Unseen Traveler's color can be chosen by you from among the color of mana used to cast him.
Cadreen, Unseen Traveler cannot be blocked by creatures who share a color with him.
If Cadreen, Unseen Traveler is your commander, you may have spells of all colors in your library.
{w}{w},{u}{u},{b}{b},{r}{r},{g}{g} or {c}{c}: change Cadreen, Unseen Traveler to the color of mana tapped to use this ability.