Tesla coil's a pretty cool effect tbh

Sold for $30 in Marketplace(~14.5 Keys using 2.05 value)

https://marketplace.tf/items/30807;5;u108

Sold for 12 Keys

http://backpack.tf/profiles/76561198117525854#!/compare/1492732800/1492819200

Sold for 13 Keys

http://backpack.tf/profiles/76561198207348327#!/compare/1493856000/1493942400

Sold for 11 Keys

http://backpack.tf/profiles/76561198340935076#!/compare/1494460800/1494547200

Sold for 15 Keys

http://backpack.tf/profiles/76561198043028890#!/compare/1489968000/1490054400

Sold for ~14 Keys in Items

http://backpack.tf/profiles/76561198108696726#!/compare/1493424000/1493510400

http://backpack.tf/item/5251281577

Sold for a Blizzardy Storm Little Buddy(11 Keys)

http://backpack.tf/profiles/76561198129850865#!/compare/1493942400/1494028800

Sold for 12 Keys

http://backpack.tf/profiles/76561198312480435#!/compare/1493596800/1493683200

Sold for 11 Keys

http://backpack.tf/profiles/76561198035312409#!/compare/1491091200/1491177600

Sold for 10 Keys

http://backpack.tf/profiles/76561198085561220#!/compare/1492473600/1492560000

Sold for 13 Keys

http://backpack.tf/profiles/76561197963500354#!/compare/1494201600/1494288000

Sold for 15 Keys

http://backpack.tf/profiles/76561198059983639#!/compare/1493251200/1493856000

Sold for 13 Keys

http://backpack.tf/profiles/76561198033370726#!/compare/1491609600/1491782400

11-15.

Credits to Mindacos for finding the proof. All I did was make the actual suggestion.