From DominionStrategy Wiki
|Type(s)||Treasure - Heirloom|
When you play this, you may trash a card from your hand.
Goat is an Treasure-Heirloom card from Nocturne, replacing one of your starting Coppers when Pixie is in the Kingdom. It provides and can trash a card from your hand, which is made even more useful since you start with one in your deck!
 Official FAQ
- Trashing a card is optional.
 Other rules clarifications
 English versions
|. When you play this, you may trash a card from your hand.||Nocturne||November 2017|
 Other language versions
|Japanese||山羊 (pron. yagi)||。 手札1枚を廃棄してもよい。|
|Russian||Козел (pron. kozyol)|
 Secret History