Halo Ring

Halo Ring enters the battlefield tapped
{t}: Add three mana of any one color to your
mana pool
{3},{t}: You get {e}{e}
{e}{e}: Put an array counter on Halo Ring
When Halo Ring has seven array counters,
remove all array counters from it and exile all artifacts, creatures, and enchantments
Array counters cannot be proliferated