From Iron Man 1 - Black Panther

Either in the fight donut ship, fight with thanos, or battle in wakanda.

I don't think I understand the question, could you explain it a bit better?

Karl Mordo(Chiwetel Ejiofor) for sure! After all is settled with Thanos I feel like he will be the big bad, he has gone rogue and dark gathering all sorts of magic powers.He may be the new Loki his green garb is uncannily similar :) He can hide in the mirror dimension anyway when it comes to the finger snap. I also think he could beat the black order and maybe Thanos too, who knows what magic he has dabbled in. Strange was acknowledged by Thanos as being full of tricks and yet we know he is more of a fair fight type of guy...Mordo believes in annihilating opponents snuffing them out first 'without hesitation'. He's my bet to win

These villains could probably survive a fight with Thanos while he wears the IG:

Hela (although if she's not on asgard she might not be as powerful)

Abomination (yeah a weaker version of the Hulk beat him but If he's scaled to current hulk with his own fighting abilities he might give thanos a good run)

Ultron, especially if he has his iron legion.

@rukelnikovftw: If an MCU Villain was in infinity war for example in the wakanda battle or in the donut ship, will they be strong enough to hold their own?

Oh... ok, there are so many, it would take a lot of time sorry, but for the record, I don't think there's anyone besides Zemo and Red Skull, that couldn't hold his own in Wakanda.