Camlann Battlefield

{t}: Add {r} to your mana pool.
Whenever a Servant creature you control dies,
put a charge counter on Camlann Battlefield.
{t}, Remove a charge counter from Camlann Battlefield: Add one mana of any color to your mana pool.
To the great sorrow of the King, the holy sword of the stars lost its luster amidst a battlefield covered with blood.