Do you put a charge counter on shrine of burning rage whenever you cast a spell and at the begini g of your upkeep or do you pick. The card specifically says at the beginning of your upkeep or whenever you cast a red spell. So do you add the counter any time either of those criteria are met or only once per turn.
{Shrine of Burning Rage}
You add a counter when either event happens. You could read it as:
At the beginning of your upkeep, add a counter.
Whenever you cast a red spell, add a counter.
Nice thanks BJ