As well as can be expected.
How to get[]
First available during the Halloween event 2015 (Oct 20th - Nov 2nd), purchased with Candy Corn.
Now available at Ghost Ship Cove in the first trade panel, purchased with Doubloons (rotating cycle with other Halloween decorations and chests).
Also available at the Bazaar using Bat Snacks social currency during the Nocturnal Drafting Table Halloween event 2018.