Underworld River Confluence

Underworld River Confluence comes into play
tapped.
{t}: Add {c}.
Put the bottom card of your library into your
graveyard, {t}: Add one mana of any color.
"Streams born of the rivers Phelgeryeton the Burning,
Vecytus the verdancy, Lethene of Forgetfulness,
Archeronia the Purifier, and Styxus the Dissolver
meet at the bottom of Noxyz and disappear from the
the underworld into unknowable depths."