Cheapest priced copy (Jumpstart 2022): $0.35 at Card Kingdom, near mint, their price list as of .
Goblin Researcher 
Creature — Goblin Wizard · 3/3 · Common · Foundations Jumpstart · #559
When this creature enters, exile the top card of your library. During any turn you attacked with this creature, you may play that card.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart 2022 | 34 | Common | $0.35 | — |
| Foundations Jumpstart | 559 | Common | $0.35 | — |
6 rulings from Wizards of the Coast
- 2 December 2022You can play the exiled card if Goblin Researcher attacked and is still in combat, has left combat, has left the battlefield, or even if combat is over.
- 2 December 2022If you control more than one card named Goblin Researcher, each one's effect is independent from the other. Specifically, attacking with one will not allow you to play the card exiled by the other.
- 2 December 2022If you exile a land card with Goblin Researcher's enters-the-battlefield ability, you may play that land only if you have any available land plays. Normally, this means you can play the land only if you haven't played a land yet that turn.
- 2 December 2022Goblin Researcher's effect doesn't change when you can play the exiled card. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty.
- 2 December 2022Casting an exiled card causes it to leave exile. You can't cast it multiple times.
- 2 December 2022The card Goblin Researcher exiles is exiled face up.