Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $10.99 at Card Kingdom, near mint, their price list as of .
Vexing Puzzlebox 
Artifact · Mythic · Commander Legends: Battle for Baldur's Gate · #343
Whenever you roll one or more dice, put a number of charge counters on this artifact equal to the result.
{T}: Add one mana of any color. Roll a d20.
{T}, Remove 100 charge counters from this artifact: Search your library for an artifact card, put that card onto the battlefield, then shuffle.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $10.99 to $19.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends: Battle for Baldur's Gate | 343 | Mythic | $10.99 | $12.99 |
| Commander Legends: Battle for Baldur's Gate | 374 | Mythic | $10.99 | $16.99 |
| Battle for Baldur's Gate Promos | 343s | Mythic | — | $19.99 |
4 rulings from Wizards of the Coast
- 10 June 2022Even 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 June 2022If 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 June 2022If 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 June 2022In 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.