The MR cards have nothing to do with redemption cards.
MR8 (Year of the Ox) can be found in HF (holofoil - the real meta-rare), CS (crystal sparkle), and gemstone refractor (apart from the diamond)
I think you missed it. There’s no MR8 CS. And Jupityr said this themselves:
Hi
I understand the MR 8 CS wasnt created but im still looking anyway just in case
The MR 8 is sent along with the Cardsmiths crypto wallet cards. They definitely exist!