What about a cap on NASUS' stacks?
Simply put, the lack of a cap to his stacks is subnormally idiotic, because literally with no skill, allows it to two shot a late game enemy champion that required even the slightest bit of skill to play. I've seen good teams and good players get destroyed by his capless q bullshit, just because "they didn't prevent him from farming". Well guess what, at some point he'll have 300 stacks and his stupidly hard slow, regardless of how good anybody is at preventing him from farming.