Spectrum Rings

Spectrum Rings comes into the battlefield with five color counters. Sacrifice a color counter and add any color to your mana pool. If there is no more counters on Spectrum Rings, add five more. Repeat this process when it has no counters on it.
{t}: Sacrifice Spectrum Rings and send out five of any color mana in your library. They come onto the battlefield tapped. You gain 5 life.