The user experience of opening disks becomes much better (more intense), if the cards start glowing when they contain greater loot, for example Tier 4 or 5 (to be defined). Obviously only when hovering over it with the mouse.
(It could be a different color for accessories or the glow could be brighter for a tier 5 than a tier 4. There are a lot of possibilities - just wanted to point it out, because it might be little work for a small but effective improvement?)