I got to Infinite for the first time in my 4th full season. And I used this deck almost exclusively (I tried a few others but they sucked, so I kept going back to this one).
It's a modded version of Jeff Hoogland's Hela Ramp deck. I switched out Hulk for Doom. https://snap.fan/decks/217422/
As Hoogland says in his video, the nice thing about this deck is there's none of usual downside you typically have with a Hela deck. Ideally, you want to go Invisible Woman -> Nick Fury (optional) -> MODOK -> Hela. But if that doesn't work, you can still get wins and cubes by just sliding over to a Ramp Deck play. Use Electro/Wave and get to your big cards. I've not been particularly good, but i found this deck was easy to pilot. Best of all, even novice players will have a feel for when to Snap and when to fold.
This is a hugely fun deck to play.