Sions W passive change -- a more fun way.
How about, instead of the current PBE buff, which is good, but a bit boring, W passive gains "gain double the hit points from kills by 'W' explosion". It'd keep power level about the same (probably a slight extra boost for jg sion, but with the season 7 stronger-but-slower-respawn jungle he's gaining less HP than in previous seasons, so it shouldn't be a problem), and this way sion will feel that he did something for the extra stacks, as opposed to them arriving automatically for something he was doing for other reasons (by far, the biggest benefit to lasthitting is gold, and it'll remain this way with the proposed change, the extra HP is just a little extra).
So how about that?
P.S. The current PBE change is that HP per (non-large) kill from W are going from 2 to 3.