Coveted Jewel

Mana cost: {6}
Type: Artifact
Set: Secret Lair Drop #799 (rare)
Price: $4.50 USD

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.

Coveted Jewel has 12 printings, first in Commander 2018 (2018). EDHREC ranks it #1,264 among Commander cards. It appears most in Tannuk, Steadfast Second decks (6,919 on EDHREC). 8 public decks on TCG run it. It has 4 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: legal

Public decks that run Coveted Jewel

Chaos Incarnate - Starter Commander Decks, led by Kardur, Doomscourge
Creative Energy - Modern Horizons 3 Commander, led by Satya, Aetherflux Genius
Exquisite Invention - Commander 2018, led by Saheeli, the Gifted
Growing Threat - March of the Machine Commander, led by Brimaz, Blight of Oreskos
Peace Offering - Bloomburrow Commander, led by Ms. Bumbleflower
Scions & Spellcraft - Final Fantasy Commander, led by Y'shtola, Night's Blessed
Silverquill Statement - Commander 2021, led by Breena, the Demagogue
Wakanda Forever - Marvel Super Heroes, led by T'Challa, the Black Panther

Commanders that run Coveted Jewel most

Deck counts from EDHREC.

Tannuk, Steadfast Second: 6,919 decks
Y'shtola, Night's Blessed: 4,791 decks
Ms. Bumbleflower: 4,238 decks
Orvar, the All-Form: 3,978 decks
Ovika, Enigma Goliath: 2,822 decks
Zedruu the Greathearted: 2,613 decks
Sami, Wildcat Captain: 1,918 decks
T'Challa, the Black Panther: 1,635 decks

Often played with Coveted Jewel

Cards that show up in the same decks on EDHREC.

Rulings

2018-07-13: A creature attacking a planeswalker you control won't cause Coveted Jewel's last ability to trigger.
2018-07-13: Coveted 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.
2018-07-13: If 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.
2018-07-13: Coveted Jewel's last ability resolves after blockers are chosen but before combat damage is dealt.