I've only been able to get five cards, the base, refractor, auto, green, and red. There is also a gold /10 card, but only one has shown up on Ebay and it was sold via BIN before I even saw it.
There is also supposed to be a blue version that exclusive to Walmart. I say supposed to be since no a single one has been offered on Ebay. Several of the Target reds have seen the light of day, but no blues--odd since you would think more card are sold at Walmart over Target.
The final card in the rainbow is a 1/1 black card....no hope for that one!
So for now, here is my mini-rainbow.