If you want to complete the third mission, I suggest playing during a tournement. There will still be people not playing fair, but at least you'll get something out of it.
And for the last mission, 200 damage, just fury & full pill Sliman or Ahkab, but Sliman has power manipulation that help his chance on winning round. (you don't really need to win the game. just the round)
You need to make Fang Pi Clang to have a legendary card.
Xx killer x5238:
Return to port:
Inflict 200 Damage with the Piranas