Cheapest priced copy (Commander 2019): $0.35 at Card Kingdom, near mint, their price list as of .
Chemister's Insight 
Instant · Uncommon · Ravnica: Clue Edition · #81
Draw two cards.
Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2019 | 80 | Uncommon | $0.35 | — |
| Commander 2020 | 108 | Uncommon | $0.35 | — |
| Ravnica: Clue Edition | 81 | Uncommon | $0.35 | — |
| Guilds of Ravnica | 32 | Uncommon | $0.35 | $0.49 |
| The List | GRN-32 | Uncommon | $0.35 | — |
4 rulings from Wizards of the Coast
- 5 October 2018If a card with jump-start is put into your graveyard during your turn, you'll be able to cast it right away if it's legal to do so, before an opponent can take any actions.
- 5 October 2018You must still follow any timing restrictions and permissions when casting a spell with jump-start, including those based on the card's type. For instance, you can cast a sorcery using jump-start only when you could normally cast a sorcery.
- 5 October 2018A spell cast using jump-start will always be exiled afterward, whether it resolves, it's countered, or it leaves the stack in some other way.
- 5 October 2018If an effect allows you to pay an alternative cost rather than a spell's mana cost, you may pay that alternative cost when you jump-start a spell. You'll still discard a card as an additional cost to cast it.