For easy money by winning card games, go to Subway Town and challenge the woman to a 'Normal' game with the following cards:
HE Grenade RC Car Bomb Dropship JK Stiles Slime Mutant Giant Mutant
This should fill or almost fill your points for allocating cards. I used this deck and won $5000 in less than an hour. It works because you are guarenteed to get all your attacking cards out. However, it is not 100% undefeatable, but I won 95% of the time. It may take some getting used to, but a definite pattern should emerge.