CR 503. Upkeep Step

  • 503.1 The upkeep step has no turn-based actions. Once it begins, the active player gets priority. (See rule 116, “Timing and Priority.”)
    • 503.1a Any abilities that triggered during the untap step and any abilities that triggered at the beginning of the upkeep are put onto the stack before the active player gets priority; the order in which they triggered doesn’t matter. (See rule 603, “Handling Triggered Abilities.”)
  • 503.2 If a spell states that it may be cast only “after [a player’s] upkeep step,” and the turn has multiple upkeep steps, that spell may be cast any time after the first upkeep step ends.