Cheapest priced copy (Commander Legends: Battle for Baldur's Gate): $0.35 at Card Kingdom, near mint, their price list as of .
Bag of Holding 
Artifact · Uncommon · Adventures in the Forgotten Realms · #240
Whenever you discard a card, exile that card from your graveyard.
{2}, {T}: Draw a card, then discard a card.
{4}, {T}, Sacrifice this artifact: Return all cards exiled with this artifact to their owner's hand.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $0.35 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Adventures in the Forgotten Realms | 240 | Uncommon | $0.39 | $0.49 |
| Commander Legends: Battle for Baldur's Gate | 299 | Uncommon | $0.35 | $0.49 |
| Jumpstart 2022 | 756 | Rare | $0.49 | — |
| Core Set 2020 | 222 | Rare | $0.49 | $0.79Out of stock |
| Core Set 2020 Promos | 222p | Rare | $1.99 | $4.99 |
| Core Set 2020 Promos | 222s | Rare | — | $2.99 |
5 rulings from Wizards of the Coast
- 12 July 2019If you discard a card but that card is not in your graveyard as Bag of Holding's first ability resolves, that card remains wherever it has moved.
- 12 July 2019You both draw and discard while Bag of Holding's second ability is resolving. No player may take any action—nor can anything else happen—until you've both drawn and discarded.
- 12 July 2019If Bag of Holding is moved to exile when you sacrifice it (most likely due to Leyline of the Void's effect), it remains in exile. It won't be returned to your hand.
- 12 July 2019If you control more than one Bag of Holding, you choose which one will hold the discarded card. Other Bags of Holding can't return that card.
- 12 July 2019If Bag of Holding leaves the battlefield, the items it contained are exiled forever (and, perhaps, scattered throughout the Astral Plane). If the same Bag of Holding card returns to the battlefield, it's considered a new object without access to the cards stored by the old object.