I guess it’s pointless to argue about this because it defies simple logic but I’m going to do it anyway:
Why does the legendary demon lord Wastrel card only increase the HP by 500 per star?
Given it is so hard to upgrade the card to any level above 5, that card yields little more than a 10 star Yeti card, but with several times the costs.
In my opinion, the card effect should be increased to +5000 HP per star, so it’s actually worth using it over e.g. Zaura or Nuaele.
With just 500 HP per star, no-one is ever going to use this card actively but is just using it as a fodder card, similarly to the Kugheri Balzermancer card, for the better legendary cards out there.
If that was the initial target of the developers, they could’ve just made the raid cubes drop legendary enhancement cards instead of actual cards…