2022-06-10 : Even though it includes rolling a die, Vexing Puzzlebox's second ability is a mana ability. It does not use the stack and cannot be responded to.

2022-06-10 : If an effect instructs you to roll more than one die and ignore one or more of them, the result is only what wasn't ignored.

2022-06-10 : If an effect instructs you to roll one or more dice and add some number to that roll, the result is the total after adding that number.

2022-06-10 : In a game of Planechase, the result of rolling the planar die is not a number and does not cause Vexing Puzzlebox's first ability to put charge counters on it.