Oxxida Spires

Oxxida Spires enters the battlefield with
two Oil counters on it.
At the beginning of your upkeep you may pay {p/r}. If you do, remove an Oil counter from
Oxxida Spires.
{t}: Add {r}. Otherwise add an additional mana
of any color if Oxxida Spires has no Oil
counters on it.
—The spires, once seeping with Ichor, now return
to their crimson glory. - Bosh, Iron Golem