Shrine of Radiant Sanctum

Whenever you cast an instant or sorcery spell,
if it's the first spell you've cast this turn, you
may exile it instead of putting it into your
graveyard. If you do, put a ritual counter on
Shrine of Radiant Sanctum.
{t}: Add {c}.
{t}, Remove ritual counter from Shrine of
Radiant Sanctum: add one mana of any color.