I was trying to think of a custom one day, and happened to be looking at the torso of ROC Cobra Commander. Nearby was a cast MU Gambit head, and noticing it I realized the CC body would be a great gambit base!
I then proceeded to put it together.
Recipe
Head - MU Gambit cast
Torso, arms, hands, upper legs- ROC Cobra Commander
Lower legs-POC rock viper

Accessories
Staff-random fodder
Cards, cig- green stuff sculpt
Energy card- green stuff and hot glue

The most fun part of this was making his trademark accessories. Especially the kinetic card energy effect. I wrapped his arm in tin foil, and then used hot glue to build it out.