Prism of Eternities

Prism of Eternities does not untap during your untap step
{5}: untap Prism of Eternities
{1}: Add 1 Mana of any color to your Mana pool
{w}{u}{b}{r}{g}{t}: put a charge counter on Prism of Eternities
Remove 3 charge counters from Prism of Eternities. Take two extra turns after this one
At the beginning of your upkeep, you may pay {4}. If you do, put a charge counter on Prism of Eternities