Abandoned Falls

If Abandoned Falls in your starting hand, you
may begin the game with it on the battlefield. If
you do, you skip your next untap step.
Abandoned Falls enters the battlefield tapped.
When Abandoned Falls enters the battlefield,
look at the top 5 cards of your library. Exile one
of them and put the rest on the bottom of your
library.
{t}: Add one mana of any color of the card exiled
with Abandoned Falls.