Whenever you roll one or more dice, put a number of charge counters on Vexing Puzzlebox equal to the result. : Add one mana of any color. Roll a d20. , Remove 100 charge counters from Vexing Puzzlebox: Search your library for an artifact card, put that card onto the battlefield, then shuffle.
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.
10-06-2022
wotc
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.
10-06-2022
wotc
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.
10-06-2022
wotc
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.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.