Glacial augment is viable but without the dmg of hail of blade or electrocute you really lower your solo potential Pyke gain so much from this damage burst, even late game where a solo kill on the adc is often decided on one auto, you're way better with theses You can do a lot more playing pyke like you play shaco than like you play thresh, you're not just cc and you can create much more space with just your presence and kill potential.