This deck can sometimes have too much mana and not much to do with it, so these two midgame power cards will be huge additions
Critically, Portents slow-trip of drawing the card on your opponents upkeep also dodges Narsets only draw one per turn rule, since the opponents upkeep is a new turn
You can throw -1/-1 counters on stuff and then laugh as they die
If you want to mitigate some of the downside, you could add Barbarian Class, Wyll, Blade of Frontiers, and Pixie Guide
(If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) When this creature enters or becomes monstrous, exile up to two target artifacts and/or enchantments controlled by different players
Niv-Mizzet, Parun Niv-Mizzets standout strength is turning every card drawn and spell cast into direct damage , allowing Dragon decks to win without relying solely on combat