I really like your list. The low 2 drop slot is hard. I feel like you're already playing the good ones. I would maybe recommend considering: Condescend ? Maybe even: Into the Roil or Blink of an Eye . I feel like once certain threats are in play your deck doesn't have a lot of answers to them and late game bouncing a mid-range threat and drawing a card is super relevant. An argument could also be made for Censor and Lat-Nam's Legacy ? Eh?

For your threats, I really like Brineborn Cutthroat . I'm also a fan of looter Jace Jace, Vryn's Prodigy  ^Flip. I personally would maybe play them over the goblins. They come in a turn sooner and I feel like they're both viable threats even if they don't start producing tokens. Not to make your list literally the list by WindyDelcarlo, but I'm also a big fan of Dack Fayden and Saheeli, Sublime Artificer .Taking a tinker'd out target or Crucible of Worlds with Dack Fayden feels reeaaallly good. I could see the goblins you have maybe being a bigger threat than Saheeli, because you don't always have a relevant threat to make a copy of. I'm also a sucker for Baral, Chief of Compliance .

Two cards that I think could be better slots are: Dive Down and Ionize . I think I would value things like: Disallow , or Supreme Will . I also like Divert better than Dive Down . It's more versatile and will probably save your creatures from the same spells as well as win you a counter war.

I would also strongly urge you to play Blood Moon and Magus of the Moon . Maybe Back to Basics .

Interestingly, only the Enigma Drake is hosed with GY hate. Crackling Drake relies on both the GY and exile, so one of them is not too badly-hit.