The first chapter is one of the strongest anthems because your opponents can't remove it and it buffs all the creatures in your deck, and then you get a cheap creature for free
In this case the upsides are nice
Jeskai Flashback: If you're playing the Commander 2019 decks straight out of the box, it means that Sevinne, the Chronoclasm is your commander, and I (as well as the community at large, based on our preview rankings) think it's the worst of the face commanders in Commander 2019 by a pretty significant margin
It can feel storm-adjacent because cascade naturally chains spells, and some builds may include payoffs like Aetherflux Reservoir
Haste enablers are especially prominent in Goblin decks, which can easily become overwhelming with Krenko, Mob Boss or Krenko, Tin Street Kingpin at the helm