Cheapest priced copy (Throne of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Bartered Cow 
Creature — Ox · 3/3 · Common · Throne of Eldraine · #6
When this creature dies and when you discard this card, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.")
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 6 | Common | $0.35 | $0.49 |
| The List | ELD-6 | Common | $0.35 | — |
4 rulings from Wizards of the Coast
- 4 October 2019Bartered 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.
- 8 November 2024Whatever you do, don't eat the delicious cards.
- 8 November 2024Food is an artifact type. Even though it appears on some creatures, it's never a creature type.
- 8 November 2024You 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.