So I am in the process of starting a John Holdzkom 2015 Topps Chrome Autograph Rainbow and will now start the 2015 Topps Mini Rainbow.
Here's two of the harder cards to find
Together these two cards ran me $28. The other cards missing are the black and base. Shouldn't be too hard to grab those though. I think that Holdzkom will be a key piece for the Pirates bullpen this year.