I'm looking for something that shifts a daily power into an encounter power. I want to take the Demigod Epic Path so I can use Blade Cascade whenever I want. Ideas?
Sure you can! But it's not going to help your goal.
There are two epic destinies which let you turn a daily power into an encounter power. Both are level 30 features in explicitly arcane destinies.
And the confusingly-named Archspell's
So... Yes, you can turn a daily into an encounter. But not the daily you want, and the method of doing it overrides the mechanic you were hoping to use in conjunction with this effect.
To my fairly certain knowledge, there exist no paragon paths nor feats nor powers that unilaterally convert a daily into an encounter.
Testing the null hypothesis.
1) If this exists, there exist a multitude of dailies that could serve well in an encounter.
2) There are daily stances that simply dish out more damage
3) Therefore, those stances would feature on epic level DPR King 3.0 builds.
4) There is no evidence of ranger-centric builds or builds focused on this strategy. Therefore, while it's impossible to say this exists, I can say that the best minds of theoretical optimization have not found it.
This is clearly broken. The broken wiki does not list it. Therefore it likely does not exist.
Additionally, if you meet the requirements there is the Lorekeeper Epic Destiny (PHB2 pg.173) which has: