I think that the use of the comma is optional here, that it functions something like an appositive. [ as in my sentence ]
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
enoonI suspect our esteemed colleague meant that "and" is optional. The comma is mandatory with an appositive.That is correct. "and" is optional! Thanks for catching that. [ I need to start taking more time to proof what I've done! ]