Here is a suggestion. THIS IS NOT A COMPLAINT! Simply something to think about for the future.
This particular dragon is quite a good little earner, I think. I've been checking the habitats and there is only one Metal Mines that I can see - i.e. no larger (4 dragon, 10,000 coin) version. I notice Royal is the same and I mention Royal because we have Royal in the Tales at the moment. Yes, I know Cursed Idol is a hybrid and can go on large Yellow and Green habitats. With the current Royal trio we have the House of Cards but it isn't typed "Royal".
I am wondering if perhaps it might be time to consider larger minor type habitats. There is one for Champions, Zodiacs and Mythics. Not suggesting today or this week, but just a thought for the future.