Citadel of Elements

Citadel of Elements enters the battlefield with a
number of charge counters on it equal to the
number of colors among permanents you control.
Whenever you cast an noncreature spell, put a
charge counter on Citadel of Elements.
{r}{g}{w}{u}, {t}, remove 10 charge counters from
Citadel of Elements: Shuffle all cards from your graveyard into your library. Take an extra turn
after this one.