It brings back memories of the 464 Manual and the Pontoon game in it. It was unfair and a fairer version was made which I believe was in an early ACU (CPC464 User), though made an appearance in the first issue of the Australian The Amstrad User magazine.I typed in some other early ones, one from Home Computing Weekly:
https://www.cpc-power.com/index.php?page=detail&num=10881has some nice looking cards with curved edges, though horrible colour scheme.