Gilt-Leaf Winnower This is one of my favorite designs, because mechanical design often has trouble with subtle concepts
The six magical inks Amber, Amethyst, Emerald, Ruby, Sapphire, and Steel, were released in a mixed-up chaotic form, resulting in a mysterious flood which damaged the Great Illuminary. When storyborn or dreamborn glimmers encounter this mixed ink, they surge with a power that changes them, transforming them into floodborn glimmers
Many less enfranchised players reported they were a bit lost and had trouble connecting with the set. You can probably guess where I'm going with this, but since third's the charm, here are one highlight and one lesson learned from Unfinity: Some players appreciated that over half of the cards were Eternal legal
Exclusive Artwork The biggest thing about serialized MTG cards, or serialized cards in any card game, is that they need to feel special