Thank you very much both for your answers!! I completely missed these infos at the time of my purchase concerning the "Rainbow Series" and the transition for the printing.
I am really happy to have finally the Red edition because personally, I do not understand too much the interest to possess an almost blue deck or with minimal differences of colours for the back, apart perhaps, a really good buy with a bargain price:
https://www.youtube.com/watch?v=9N_nSY4QXrQ&feature=youtu.be&t=307Instead, I think that a really purple version would have been much more interesting even if this goes against the principle of the "mid-print run from blue to red", as you said. But I guess that for some collectors or admirers of David Blaine and/or his work with the cards, it is necessary to respect it. However, to be quite honest, I consider more the "UV Blue" and "Purple" versions as semi-limited editions, or a business method for selling more and at the higher price while limiting the losses, in my opinion.
And I can understand the high price (
https://phillymagic.com/shop/WhiteLionsSeriesARainbow) as these "rainbow" decks are apparently extremely rare but for this amount, I prefer to keep my money for other decks, for example, the Red Gatorbacks: a very nice metallic color for the back and a special card which replaces the blank card of the green model. Real modifications instead of minor details, but again, just my opinion..