Cyclops, Wolverine, Gambit, Rogue, and Storm vs Angle Man, Artemis, Giganta, and Silver Swan (Vanessa)
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Location: Abandoned City unfamiliar to both teams
Equipment: Standard equipment for both teams
Rules: No BFRs/Ringouts, No Preptime, They fight in character, Avion life is available for Silver Swan, Rogue has her absorbing powers + strength and flight powers
Hm, this is kinda a tough one... the in-character bit definitely helps the X-men, they'll work together better, and do have the firepower that'll work on their foes.
On the flip side, Silver Swan is easily the strongest on the field and Giganta is no slouch. Plus, Angle Man is annoying as heck to fight and may do stuff like suddenly place Giganta next to Storm or Silver Swan so she can scream at everyone!
I'd say, probably WW's gallery, thanks to the utter annoyingness of Angle Man.
Angle Man, if he doesn't fight like an idiot, he could utilize his angler.
Vanessa would be trouble also. Her screams can stun them. She can also be annoying using birds.
I assume Giganta may go down, because most fights that she is in, she ends up on the ground. And the way X-men take out Sentinels, I could see her taken out pretty easily. Could be wrong about that, though.
Artemis would probably get taken out easily also. She is somewhat good at H2H and using weapons, but other than that, I don't believe she has much without the spell allowing her to siphon Diana's powers. Unless the Gauntlet of Atlas is considered her "standard" equipment. Even then, I am not sure that it would be enough.
Of coarse, I am only guessing here, but I gave it a try.