I think supporting 1.5 straight aggro decks is about where I want to be at the table. I really want to encourage gameplay that loops through the deck, and creating decks that prey on that by trying to kill you in less than 15 cards doesn't exactly help. I do still want a creature specific aggro to exist in general, since I like decks having to have an answer against a wide variety of strategies instead of it just becoming exclusively a grind fest.

Anyway, this removes one lower performing aggro card, hopefully not misleading anyone, and also adds a land that plays really interestingly with the bounce lands, and hopefully is fine enough on it's own.

Pongify -> Unable to Scream fits blue's role in the format more. One mana "removal" that isn't nearly as good on the aggro side as the slow deck side is great.

I'm not sure what deck ever wants sleep-cursed faerie over invisible stalker, so let's give blue decks another fun thing to do instead with Shelldock Isle

Nim Deathmantle is a little bit slow in the format now-a-days, 4 mana is just a lot to leave up when it's fighting against cards like Tel-Jilad Stylus. Insidious Roots is really interesting, should maybe make the Chthonian Nightmare decks more interesting, and for my own silly purposes puts a non-land card back into the Golgari section, which feels like it should definitely be filled in such a graveyard heavy cube.