Thought Erasure
Sorcery
Target opponent reveals their hand. You choose a nonland card from it. That player discards that card.
Surveil 1.
"It's truly the highest honor, isn't it? To be remembered? Pity for you."
Anna Steinbauer
Guilds of Ravnica (GRN)
• #206Rulings
Some 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.
(wotc • 2024-01-12)
You 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.
(wotc • 2024-01-12)
You surveil 1 even if the opponent doesn't discard a card, perhaps because they had no cards in hand at all.
(wotc • 2018-10-05)
Rulings
Some 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.
(wotc • 2024-01-12)
You 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.
(wotc • 2024-01-12)
You surveil 1 even if the opponent doesn't discard a card, perhaps because they had no cards in hand at all.
(wotc • 2018-10-05)