As your commander, they're always available on turn 1, and you can reliably recast them multiple times before the command tax gets too high
It has no inherent synergy other than having pirate in its type line, and it usually puts you in critical territory as well
Obviously she has above-rate stats, but the fact that she weakens the Toxic mechanic is nice upside, as is her ability to reanimate a creature or artifact that has died during your turn
P/T Number 208 Language English Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (9/20/2024) The value of X is determined only once, as Arabella's ability resolves.
You can check out the full gallery of my favorite cards I pulled from the new Evolving Skies expansion below