well that depends, since no sides are the same, and each dice is said to have 6 sides, my wild guess would be 46656

also as far as the winning set, could I assume that each dice different numbers are in order, in such a way that one dice would always win since it's lowest number is higher than the other two's highest number for example

Green = 1 2 3 4 5 6
Red = 7 8 9 10 11 12
Blue = 13 14 15 16 17 18