This means in order to obtain it, you would need to learn the Yu-Gi-Oh
However, there are other rewards to earn for each difficulty, so if those interest you, I'd still recommend at least beating those once
(*This card's "The name of this card/Digimon is also treated as [SkullKnightmon] and [DeadlyAxemon]" has been changed to "(Rule) Name: Also treated as [SkullKnightmon] and [DeadlyAxemon].") This is a special rule for this card that always treats it as if it also has the [SkullKnightmon] and [DeadlyAxemon] names
Think I've spent too many gems on Revival of Legends but ended up getting The Azure of the Ivory secret pack so many times I managed to make an All Blue-Eyes deck (Seto Kaiba would be proud ) Yu-Gi-Oh How to Best Spend Your Yu-Gi-Oh Master Duel Gems on Card Packs - What's Worth it
In addition to solid colors, you can print full-color patterns and customize your own pokemon card
Thats more than a quarter of their starting life points, and can be a great way to win a duel if your opponent goes on the defensive