Volume 6 is from Zoids Card Colosseum "Second Version". It is also the second installment of this set, which has a different card layout and more dramatic images than the first five volumes. The series is exceptionally rare, and finding cards from it can be difficult and expensive.
[P] Plated Text cards (some name and effect texted is printed in gold foil)
Card Gallery
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Secret Card Gallery
Zoids Colosseum Second Version contained 'secret cards' which were alterative versions of their number counter part. So far we have confirmed this in Volume 6. You can see in our example card that it has the word 'Secret' in katakana before the designation number, and that it's number is the same as the other Iron Kong Yeti card in this volume, only the image is different.