Byronic said:
Blade cascade is a Daily power iirc and thus does not count.
Not for the encounter power regeneration, no, but that's not what he was talking about.
Make a level 30 Elf Ranger demigod with Cascade of Blades
Burn all your encounter powers except for your racial, Elven Accuracy
Use Cascade of Blades, then use your racial encounter ability after the first role. After using Elven Accuracy to reroll the first attack of Cascade of Blades, you'll be out of encounter powers, at which point Divine Miracle regenerates one encounter power of your choice. You immediately regenerate the racial encounter as soon as you lose it, at which point, you could in theory use it again to re-reroll your attack. Repeat until it hits, and then repeat on the offhand attack. Repeat until the thing you're fighting is dead. For added insult, don't stop rerolling until they're criticals.
Now, when my buddy first showed this to me, I could find any wording within the rules that would prevent someone from doing this, forcing a flat out DM "no, because I said so" to prevent it. However, after looking at it again, I think my ruling would be this:
The regeneration happens after you use the power, however at that point the action is over and therefore you could not reroll the attack again. The power isn't officially exhausted until the action is over, is what I'm trying to say.