it has same rarity with butterfly knife, both auctioned 10 in game. both has a xmas versions which has same stats and 20 in game. buff wont happen, butterfly and void has same stats and same rarity. Trade price's wont effect anything since staff isnt setting their trade price. Butterfly and Void stats are same. void is just a diffrent skin butterfly.

Kiwi/Hunter = Katana = Saber both has same speeds and damages. diffrent prices because of their "skin/look".