I had a lot of fun with this team and I've been trying to put something like it together for a little while.

The gimmick is the combination of -
And
The effect of which, is that you can free action mind control up to 3 opposing character per turn and lock 1 of them out from being able to make attacks till your next turn.

In addition, Maria hills effect won't come into play until after the mind control is fully resolved. Therefore two of the MC'd targets can attack the main target who won't be able to be attacked again afterwords.
Sneaky sneaky and pretty neat.

Juggernaut is present because he's pretty cool anyway, and also you won't be picking map with this team pretty much ever. And generally speaking, any map that is Bad for Onslaught, is Good for Juggernaut and vice versa.

Jane foster is present because, what else you gonna do for 30 points? And because Juggernaut is going to take some hits, and Onslaught may want to Colossal push.

Don't forget, Onslaught doesn't have to successfully hit his targets to trigger Maria's effect, which with his range and improved targeting makes it nearly impossible to effectively avoid.
Also don't forget about Maria's shield TA, Leadership on Jane, and Maria's Barrier can be used to heal Juggernaut.

I'm sure there is room for improvement in the concept, but it was pretty baller for a first attempt at trying out the mechanic.

Very nice!
I realized you can have three maria hills on a 300pt team with onslaught. Post-rotation, (with no IDs) that will be so gnarly!
Welcome to pleasant maria meta!
or you could just have 3 ultra-humanites and save yourself 50pts for vulture

Onslaught is pretty awesome!

I would find a way to insert Dario Agger so that you can target also WWE