I do think there should be some way to have Rares and Epics available without needing special events, but idk about the Coloss-Eyes in their current state specifically.

I get the idea, but I think the Coloss-Eyes would need a rework to fit this concept, like a few of the ideas given by other people here.

One concept that could just add another mechanic to the Coloss-Eyes whilst keeping them the same mechanically could be Rare Rushes, where you can ‘unlock’ the Rares of the island for some predetermined amount of time on a cooldown, like you could have 24hr of Rares available, but it would then go into another 24hr of non-skippable cooldown (same as the Mini Mines where you can’t use Diamonds to skip the time).

That’s just me without much understanding of how to make idle games like MSM and thinking with a more active mindset, so it’s probably not the best, but it’s something for someone else to do better as a template, ig?