If you're looking to build a team of villains to fight your heroes, you could certainly do worse than the Serpent Squad/Serpent Society. We don't even have half the full line-up yet, but they don't tend to send all their members on all their missions. Who have we got?
That's a start! Certainly enough to give Captain America or any solo hero of your choice a little bit of trouble before the major villains show up.
You know, a team like the Serpent Society would've made great recurring villains in the MCU to put up an actual fight in place of the mastermind-type villains. On the other hand, considering the MCU fell into that problem of killing off their villains at the end of a film, I guess that'd winnow their ranks down pretty quick.
But it's kind of a shame that the ones listed are spread out over several years and so can be quite hard to find now. I remember seeing the Eel and Rock Python on store shelves, but never Viper or King Cobra.
Captain America: Civil War was originally announced as Captain America: Serpent Society: https://twitter.com/Robbygew/status/1365801690373439493
Now I feel doubly cheated that the fourth movie isn't about them either. Give us some damn supervillain teams already, MCU! (Thunderbolts doesn't count if it's not incognito Masters Of Evil.)
I'm also mad we haven't gotten Death Adder or Anaconda since they're not easy repaints.
Oh, man, Death Adder! All we need is a Scourge of the Underworld to gun him down.
I've been tempted, as often as I see most of this gang loose., but I put too much into building up a Master of Evil team this year to have the space or inclination for the snakes.