Xen, Alien World

{t}: Add {c}.
{1}, {t}: Add {g} or {u}.
Whenever you tap Xen, Alien World for
mana, you may exile the top card of your library. If it's a creature card, you may put it into your hand.
"The border world, Xen, is in our control for
the time being, thanks to you." - The G-Man