Only 1 of 1 with effect, very short history. Was listed by previous owner for 100 keys but accepted counter offer for 90 pure keys

https://backpack.tf/item/7280840960

https://backpack.tf/profiles/76561198342393935#!/compare/1620950400/1621036800

https://backpack.tf/profiles/76561198008113369#!/compare/1620950400/1621036800

Other known pure trade was from October 2020, unable to determine exact value from them due to history of keys, possibly 45 keys from back then. Not valid to use price as that trade was well over 3 months ago

https://backpack.tf/profiles/76561198163723555#!/compare/1603843200/1604102400

https://backpack.tf/profiles/76561198008113369#!/compare/1604016000/1604102400

First Unusual Suggestion. Since hat with effect has short history and is 1 of 1, figured why not