Bartered Cow
Creature — Ox
When this creature dies and when you discard this card, create a Food token. (It's an artifact with "
, 
, Sacrifice this token: You gain 3 life.")
At the market, no one heeded Hilda's frantic mooing. The fae curse was turning out even worse than she had feared.
イラスト：
Throne of Eldraine#6コモン英語適正
裁定
Bartered Cow's ability is a triggered ability, not an activated ability. It doesn't allow you to discard it or sacrifice it whenever you want; rather, you need some other way of discarding it or causing it to die.
Whatever you do, don't eat the delicious cards.
You can't sacrifice a Food to pay multiple costs. For example, you can't sacrifice a Food token to activate its own ability and also to activate Maraleaf Rider's ability.
Food is an artifact type. Even though it appears on some creatures, it's never a creature type.