The reason is simple: it's the squirrel commander
Alrunds Epiphany I am less sure on than the previous two cards, but so far it has been playing well for me and has certainly felt like a more powerful top-end card than Icebreaker Kraken
Its incredibly easy to tap creatures in these colors, be it with white tappers or with artifacts, or with blue creature spells that enter and tap/freeze other creatures
There are also two cards that care about Incubators without themselves having incubate
These reprints may make some of them more accessible, but, in some cases, how emotionally attached players are to the original prints can influence how valuable the new versions are and keep the old ones popular
This opens up an avenue for which Super Rejuvenation can be utilized effectively, albeit small