Just a bit of nitpickiness, but Daedalus doesn't die in his flight, if I remember correctly. With that in mind, I have several suggestions.
1. Remove the limit on Daedalus
Just to follow what I believe to be true, his lack of death means that he can indeed fly a tad higher. In order to balance that, I have a few more ideas. Sure, you could argue that he never does get as high as his son, but I'm going for him having traveled farther rather than higher with this suggestion.
2. Have Icarus have a higher base stat set while Daedalus has a lower base attack.
Just to work with the suggestion of Daedalus having no limits.
3. Double cost for rise.
Dive on a non-
creature [Pegasus] costs only 1
. Since this will be a permanent boost and reusable at that, it seems reasonable to double the cost as well.