Finishing 2nd on the Halloween Event 2020 leaderboard was the only way to get this Unique knife, and that window closed long ago, so it can't be obtained anymore. Only a few exist, and because there's no set and no chroma version, its appeal comes down to being a pure leaderboard trophy from Halloween 2020.
Questions players ask
How much is Silver Vampire's Edge worth?
There is no stable price: trophies rarely change hands and deals happen privately. The number on value lists is symbolic.
Can you still get Silver Vampire's Edge?
No. It was awarded for a leaderboard place in an event and is not given out again.