Cheapest priced copy (Commander 2021): $0.49 at Card Kingdom, near mint, their price list as of .
Coveted Jewel 
Artifact · Rare · March of the Machine Commander · #353
When this artifact enters, draw three cards.
{T}: Add three mana of any one color.
Whenever one or more creatures an opponent controls attack you and aren't blocked, that player draws three cards and gains control of this artifact. Untap it.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
11 printings · $0.49 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Bloomburrow Commander | 268 | Rare | $0.69 | — |
| Commander 2018 | 54 | Rare | $0.69 | — |
| Commander 2021 | 240 | Rare | $0.49 | — |
| Final Fantasy Commander | 341 | Rare | $0.49 | $2.99 |
| Modern Horizons 3 Commander | 287 | Rare | $0.49 | $6.99 |
| March of the Machine Commander | 353 | Rare | $0.49 | — |
| Marvel Super Heroes Commander | 196 | Rare | $0.59 | $0.49 |
| Marvel Super Heroes Commander | 429 | Rare | $1.29 | — |
| The List | C18-54 | Rare | $0.49 | — |
| Starter Commander Decks | 262 | Rare | $0.59 | — |
| Secret Lair Drop | 799 | Rare | $6.49 | $6.99Out of stock |
4 rulings from Wizards of the Coast
- 13 July 2018A creature attacking a planeswalker you control won't cause Coveted Jewel's last ability to trigger.
- 13 July 2018Coveted Jewel's last ability triggers after you declare blockers (or declare no blockers at all) if any attacking creatures are unblocked. It doesn't matter if some attacking creatures were blocked.
- 13 July 2018If more than one opponent attacks you at the same time, Coveted Jewel's last ability triggers for each of them. You choose which player ends up with Coveted Jewel, but each of them draws three cards and has a chance to activate its mana ability.
- 13 July 2018Coveted Jewel's last ability resolves after blockers are chosen but before combat damage is dealt.