If you have more than one commander (because of a partner ability, for example), you choose one of your commanders when the ability resolves to determine how much damage the ability deals
However, there is also no limit to how often or how many times you can change the language of your game, so you can use this to your advantage to collect cards of a specific language, or even build up a mixed collection of cards featuring a variety of different languages
But the Staff works and I often add it to my Commander brews for you where appropriate
She's a fine Faerie Tribal alternative to Oona, Queen of the Fae, giving you access to White and generally being safer / more consistent than the higher costing Oona, though Oona will remain superior if you're looking to win with infinite mana combos
It was never going to get the top spot, but for a card that was originally printed in 1998, this has held up well over the years
The flaw in this theory is that typically it takes time for the TCGPlayer market price to adjust, so this would have to be done in advance