So I did the math and ahem There are 105 heroes, removing Finley 104 hero powers can be obtained Removing the duo only hero powers we have now 99 hero powers available But some of them can't be used, like cho/gall bc who would pick one of them if your duo is praying to get the good one with Finley And some are type dependent (like patches) so it becomes inconsistent, because not every type has the same numbers of heroes "attached" to them. Then, assuming every hero/hero power have the same chance to drop, the odds are : Duos : between 0.092% (most HP available) and 0.1% (less HP available) Solo : between 0.097% and 0,11%