Cheapest priced copy (Commander 2018): $0.35 at Card Kingdom, near mint, their price list as of .
Borderland Explorer 
Creature — Elf Scout · 3/1 · Common · Commander 2018 · #133
When this creature enters, each player may discard a card. Each player who discarded a card this way may search their library for a basic land card, reveal it, put it into their hand, then shuffle.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2018 | 133 | Common | $0.35 | — |
| Conspiracy: Take the Crown | 61 | Common | $0.35 | $0.49 |
| The List | C18-133 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 23 August 2016Players decide whether or not they’re discarding a card in turn order. Each player will know if previous players are discarding, but not what they are discarding. All cards to be discarded are set aside, then revealed and discarded simultaneously. Similarly, all basic land cards searched for are set aside, then revealed simultaneously.