https://twitter.com/MangaUK/status/1003994850893520896

The prizes appear to be:

A two-in-one Blu-ray containing Yu-Gi-Oh! Bonds Beyond Time and Yu-Gi-Oh! The Dark Side of Dimensions

A poster of Yu-Gi-Oh! The Dark Side of Dimensions

A Yu-Gi-Oh! card binder with a pack of surprise cards

Source