Chaos Wand

Mana cost: {3}
Type: Artifact
Set: Core Set 2019 #228 (rare)
Price: $0.34 USD

{4}, {T}: Target opponent exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then put the exiled cards that weren't cast this way on the bottom of that library in a random order.

Chaos Wand has 6 printings, first in Core Set 2019 (2018). EDHREC ranks it #4,353 among Commander cards. It appears most in Tasha, the Witch Queen decks (3,311 on EDHREC). 4 public decks on TCG run it. It has 6 official rulings.

Legality

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

Public decks that run Chaos Wand

Exit from Exile - Commander Legends: Battle for Baldur's Gate, led by Faldorn, Dread Wolf Herald
Grand Larceny - Outlaws of Thunder Junction Commander, led by Gonti, Canny Acquisitor
Odds and Ends - Secret Lair Commander, led by Yennett, Cryptic Sovereign
Planar Portal - Forgotten Realms Commander, led by Prosper, Tome-Bound

Commanders that run Chaos Wand most

Deck counts from EDHREC.

Often played with Chaos Wand

Cards that show up in the same decks on EDHREC.

Rulings

2018-07-13: If you wish to cast the exiled card, you must cast it while Chaos Wand's ability is resolving. You can't cast it later in the turn. A spell cast this way may be cast at a time you normally wouldn't be able to cast a spell of that type, but other restrictions (such as "Cast this spell only during combat") are enforced.
2018-07-13: If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, such as that of Tormenting Voice, those must be paid to cast the card.
2018-07-13: If you don't cast the exiled instant or sorcery card, it's put on the bottom of that library with the other cards.
2018-07-13: If the exiled card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
2018-07-13: If the opponent exiles their entire library without exiling an instant or sorcery card, that player stops exiling cards, and the exiled cards are put into their library in a random order.
2018-07-13: The opponent stops exiling cards as soon as they exile any instant or sorcery card. You don't choose which card type to look for.