Galssion's Core

Galssion's Core enters the battlefield tapped.
{t}, Roll a 6 sided die:
On a 1, add {w}. On a 2, add {u}. On a 3, Add {b}. On a 4, Add {r}. On a 5, Add {g}.
On a 6, Add {c}.
{t}: Sacrifice Galssion's Core: Exile all cards
in target players graveyard.