Farewell is possibly the best boardwipe in the whole of commander, with its versatility and ability to exile (not destroy, importantly) whatever you need at that moment while protecting the other types you want to keep around
Additionally, by simply paying two mana and two life, you can draw a card at any time, preventing you from ever simply running out of plays
And maybe add a few Negations to your sideboard for next time!
Youre more likely to use it in a +1/+1 counters build to give your creatures trample, a deck where you can use it like an Overrun without the stat buff
The fact that it remains mostly as it was in the time when Storm was legal is a testament to the strength of the deck
It not only replaces itself and can take out a creature thanks to deathtouch, it's also an evasive flier and an artifact creature, meaning it has plenty of synergies to work with