Jan 29, 2018
I was wondering if all players get priority during the upkeep step when there are no spells or abilities on the stack.
Yes.
When a player’s upkeep step begins, first any triggered abilities that triggered when the step began are put on the stack and then players get priority starting with the player whose turn it is.
Even if there are no triggered abilities to go on the stack, players still get priority in the upkeep step.