Prismatic Powerstone

{t}: Add {c}{c}{c}{c} to your mana pool.
{4}{t} Add {w}{u}{b}{r}{g} to your mana pool.
"Every now and then you dig up a rare variant of a
powerstone. One time, Th found one that but have
been made near the end. It produced the normal
power one would expect. But if Fed power 0 it
produced every type of mana. It could power almost
anything." - Mishra