This has been bugging me for a little bit and was hoping someone could shed some light on the topic.
I was going through some of my old EX cards and noticed that some of them were lacking the cosmos pattern in the holofoil. One specific example that stood out is Sceptile EX in Crystal Guardians.
Example of Sceptile EX vs any other EX in the set:
In looking more it appears to be all the Delta Species EX cards came in this style (sans Cosmos pattern). Any idea why they decided to remove the holo pattern for delta species EX cards in particular? Just curious. The gold border made the Rare Holos stick out and look beautiful but in removing the pattern from the silver EXs they just look plain and bland in comparison to the non delta EXs.
Side note, I believe that the Sceptile EX was the only card of that style made until the release of Dragon Frontiers where all the EXs in the set were delta species and had the same holo pattern as Sceptile EX. So it was kind of the oddball card in Crystal Guardians.