Marvel vs Capcom 2/MSP
As Desmond 'X-cutioner' Pinkney said, "Duc created MSP. Shady K and SooMighty refined it. And Yipes remixed it and revamped it to make it the best team in the game."
MSP wants to hit fast and quickly, and fortunately because of the combination of Magneto's mobility and the knockdown and priority of Psylocke's assist, this is not difficult. However, your execution must be spot-on and you might have a hard time getting in range to go for a mixup on characters like Sentinel.
Note that while playing at breakneck speed like Soo or Mixup or Yipes is an effective way to fluster the other person into getting double-snapped, it is equally important to know when to back off and bait out the other player. For example Ricky Ortiz's MSP would often start out with cLK, backdash, dash forward with Storm-A assist coming through and often get a double-snap in response to that cLK feint.