Cheapest priced copy (Throne of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Memory Theft 
Sorcery · Common · Throne of Eldraine · #96
Target opponent reveals their hand. You choose a nonland card from it. That player discards that card. You may put a card that has an Adventure that player owns from exile into that player's graveyard.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 96 | Common | $0.35 | $0.49 |
4 rulings from Wizards of the Coast
- 4 October 2019You choose which exiled adventurer card, if any, to put into that player's graveyard after seeing their hand. You may do this even if that player has no nonland cards in hand, or even no cards at all.
- 4 October 2019If an effect refers to a card, spell, or permanent that has an Adventure, it won't find an instant or sorcery spell on the stack that's been cast as an Adventure.
- 4 October 2019An effect may refer to a card, spell, or permanent that "has an Adventure." This refers to a card, spell, or permanent that has an adventurer card's set of alternative characteristics, even if they're not being used and even if that card was never cast as an Adventure.
- 4 October 2019Memory Theft allows you to put any face-up exiled card with an Adventure that player owns into their graveyard, not just one that was cast as an Adventure and exiled.