All the teams above are great suggestions. Carol is a natural pairing and Coulson, C&D, or Drax are all viable thirds.Another interesting team that works surprisingly well is Wasp + 3Falcon + 2Bullseye. Match purple at every opportunity so that Bullseye is making defense tiles. These will protect you until you have enough AP to fire Falcon's purple, which generates more defense tiles. Gather yellow in-between purple matches so that Falcon is buffing all those tiles with his passive. Then, when the board is filled with defense tiles, use Wasp's yellow to flip them all into strike tiles (which buffs them even more) and destroy your foes.
All three characters generate AP in some way, so Mockingbird can get her free powers launched more quickly. All three characters use countdowns, so Carol can buff existing tiles to the moon and back. This team is just a lot of fun to play, and once you get Wasp's blue going a match can snowball quickly.
I don't understand why one would put C&D with Wasp? Doesn't seem like a jiving duo.
Its magic that this topic came up from over a year ago and did not get closed.