Build
45 UXM014 Riptide
45 UXM014 Riptide
45 UXM014 Riptide
40 UXM018 Vanisher
60 UXM047 Mystique
w/25 SMWW063P Brainiac

5 AOUR100 Avengers Round Table
5 NFAOSNFID-013 Red Hulk ---> 100 pt OP LE Red Hulk (with the #2 power on the table the entire team gets Poison, and you can call him in with #3 power if you actually get there)
5 WFWFID-013 The Atom ---> 15 pt Atom (easy to call in and retaliate)
5 NFAOSNFID-007 S.H.I.E.L.D. Level 7 ---> 60pt Peggy Carter
5 NFAOSNFID-002 Black Panther ---> 45 pt Starter Black Panther (not a lock, but he's useful and provides lots of combat tricks once you get your Riptides locked on the enemy)
5 WFWFID-020 Nightwing ---> 25 pt FF Nightwing (Outsiders, grants L/C to Riptide Squad)
5 AVASAVID-007 Nova ---> 60 pt GotG Nova
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295

Initially I planned on this being a Red Lantern team, but I changed it to fit the new Modern instead. I also thought about putting Proteus in over Brainiac and cutting the Table down to 5 cards, but I want a full table and like the idea of a pesky outwitter. I still need to think of a decent 6th card for after the GotG rotation. anyway. Was thinking SHIELD Level 1, or possibly another SHIELD Level 7 since they're so versatile.

Any other ID cards/changes I should consider?

proteus instead of brainiac

I think it's an interesting team. That said, I see little dmg output from the multiple Riptides. Yes, there's 3 of them and they all free-pulswave every turn; but that ammounts to only 3 dmg... until you pull off that Mutant massacre trait. Anyhow, I'd suggest including Proteus instead of the Round Table; might provide better stats and then can jump to the board and wreck some havock...