MTG Deck: Niv Mizzet Reborn

I'm looking for some includes that I might have over looked. For my playgroup the deck does decent but I would like to step it up a little. Sorry if something is messed up. Is the first time I've ever posted.

Deck: https://tappedout.net/mtg-decks/03-06-19-SNJ-niv-mizzet-reborn/