Suggestion: Make the “upgraded monsters” cards like Hydra Lord and Dragon Rider add +400 per dragon/hydra/whatever on the field to each Dragon the player controls. Keep the current cost the same. Keep the other abilities these monsters have the same (ie. the DRagon Riders super blast). Thus, if there are 3 dragons (both corrupted and player controlled) on the field, then the player’s dragons (including the Lord) gain an extra 1200 power each.
Reason: I think many of us agree the super monsters want to be useful, but for the cost, they simply are a luxury at this point. They need something interesting to make them worth the cost. With the above added ability, not only are the super monsters more desirable, it makes their normal versions also a lot more desirable. Suddenly, dropping 1500 gold for a Dragon is a lot more palatable when you know the more Dragons out there, the more powerful each one wil get.