Nightmare Incursion 
Sorcery
$1.09 #22638 0.47 18.1 years
Search target player's library for up to X cards, where X is the number of Swamps you control, and exile them. Then that player shuffles.
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Cards similar to Nightmare Incursion expected a card that isn't here?
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Denying Wind84%
$0.41↓#224310.88↑26.3 years↑
"Search target player's library for up to seven cards and exile them. Then that player shuffles."
Mana Severance76%
$4.99↑#14912↑0.20↓28.9 years↑
"Search your library for any number of land cards, exile them, then shuffle."
Sadistic Sacrament73%
$0.78↓#17055↑0.70↑16.9 years↓
"Search target player's library for up to three cards, exile them, then that player shuffles. If this spell was kicked, instead search that player's library for up to fifteen cards, exile them, then that player shuffles."
Extract72%
$5.09↑#16617↑0.5724.9 years↑
"Search target player's library for a card and exile it. Then that player shuffles."
Neverending Torment71%
$0.75↓#239330.4821.3 years↑
"Search target player's library for X cards, where X is the number of cards in your hand, and exile them. Then that player shuffles."
Mire's Toll70%
$0.15↓#221500.12↓16.6 years↓
"Target player reveals a number of cards from their hand equal to the number of Swamps you control. You choose one of them. That player discards that card."
Selective Memory70%
$0.38↓#219900.73↑16.6 years↓
"Search your library for any number of nonland cards, exile them, then shuffle."
Mind Sludge70%
$0.17↓#199860.90↑24.6 years↑
"Target player discards a card for each Swamp you control."