Skellex, I think it seems great. I suggest removing the red in the deck, as it does not really work well in the deck. I would add 4 more of one more infect creature, and 2 more forests. I would add two low-cost growth spells, you can still keep the turn 3 win, but make the deck a little more consistent. I would also consider removing1 or 2 copies of the
Artful Dodge and
Distortion strike and bring in more buff spells. This isn't necessary, but it might make the deck a little faster. While I was building my version of the deck, I definitely benefited from reading and watching
https://www.mtggoldfish.com/articles/budget-magic-35-infect-modern.
It is the most basic version of your deck and my deck. It is really well optimized and might help you make the deck overall more consistent while keeping the speed.