Unfinity, which contains all the Eternal-legal cards.
Scrolling through these however a cataloguing issue becomes apparent: for every Acorn card that has a Showcase treatment, the Showcase version is incorrectly filed in the Eternal set, despite the card still being Acorn.
Simply scrolling down the either Unfinity set page makes it very clear this is occurring with lots of different cards, and it's the Showcase version every time.
Unfinity's cards are sorted into two different sets:
Scrolling through these however a cataloguing issue becomes apparent: for every Acorn card that has a Showcase treatment, the Showcase version is incorrectly filed in the Eternal set, despite the card still being Acorn.
Take Vorthos (Showcase) for an example:
Simply scrolling down the either Unfinity set page makes it very clear this is occurring with lots of different cards, and it's the Showcase version every time.