Cheapest priced copy (Guilds of Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Thought Erasure 
Sorcery · Uncommon · Guilds of Ravnica · #206
Target opponent reveals their hand. You choose a nonland card from it. That player discards that card.
Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guilds of Ravnica | 206 | Uncommon | $0.35 | $0.49 |
| Guilds of Ravnica Promos | 206 | Uncommon | — | $0.49 |
| The List | GRN-206 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 5 October 2018You surveil 1 even if the opponent doesn't discard a card, perhaps because they had no cards in hand at all.
- 12 January 2024Some spells that instruct you to surveil require targets. You can't cast a spell without choosing legal targets. If all of those targets become illegal, the spell doesn't resolve and you won't surveil.
- 12 January 2024You perform the actions stated on a card in sequence. For some spells and abilities, you'll surveil last. For others, you'll surveil and then perform other actions.