Demonic Collusion 
Sorcery
$3.40 #15273 0.12 19.9 years
Buyback—Discard two cards. (You may discard two cards in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.)
Search your library for a card, put that card into your hand, then shuffle.
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Cards similar to Demonic Collusion expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Demonic Tutor98%
$58.70↑#62↑1.58↑33.1 years↑
"Search your library for a card, put that card into your hand, then shuffle."
Diabolic Tutor98%
$1.10↓#481↑0.50↑24.9 years↑
"Search your library for a card, put that card into your hand, then shuffle."
Diabolic Intent96%
$15.95↑#271↑0.74↑25.6 years↑
"Search your library for a card, put that card into your hand, then shuffle."
Razaketh's Rite96%
$0.29↓#10149↑0.109.1 years↓
"Search your library for a card, put that card into your hand, then shuffle."
+1 more matching line
Emeritus of Woe // Demonic Tutor94%
$11.77↑#3484↑1.58↑0.4 years↓
"Search your library for a card, put that card into your hand, then shuffle."
Rune-Scarred Demon94%
$0.80↓#1293↑0.54↑15.1 years↓
"When this creature enters, search your library for a card, put it into your hand, then shuffle."
Diabolic Revelation92%
$3.84↑#8668↑0.36↑14.1 years↓
"Search your library for up to X cards, put those cards into your hand, then shuffle."
Illicit Shipment90%
$0.29↓#10249↑0.47↑4.4 years↓
"Search your library for a card, put it into your hand, then shuffle."
Grim Tutor90%
$23.91↑#700↑0.91↑27.2 years↑
"Search your library for a card, put that card into your hand, then shuffle. You lose 3 life."
Mastermind's Acquisition90%
$1.51↓#8522↑0.53↑8.6 years↓
"• Search your library for a card, put it into your hand, then shuffle."
Splinter's Technique88%
$2.03↓#5706↑0.00↓0.5 years↓
"Search your library for a card, put that card into your hand, then shuffle."
Planar Portal88%
$1.71↓#133550.26↑25.9 years↑
"
, 
: Search your library for a card, put that card into your hand, then shuffle."
, : Search your library for a card, put that card into your hand, then shuffle."
Demonic Bargain88%
$0.27↓#146490.114.8 years↓
"Exile the top thirteen cards of your library, then search your library for a card. Put that card into your hand, then shuffle."
Case of the Stashed Skeleton87%
$0.34↓#6707↑0.132.6 years↓
"Solved — 
, Sacrifice this Case: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
, Sacrifice this Case: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
Final Parting86%
$0.40↓#2605↑0.32↑8.4 years↓
"Search your library for two cards. Put one into your hand and the other into your graveyard. Then shuffle."
Dark Petition86%
$2.94↓#3785↑0.41↑11.1 years↓
"Search your library for a card, put that card into your hand, then shuffle."
Profane Tutor85%
$4.42↑#1701↑0.52↑5.3 years↓
"Search your library for a card, put that card into your hand, then shuffle."
Hour of Victory84%
$0.27↓#134670.211.6 years↓
"Max speed — , Sacrifice this enchantment: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
, Sacrifice this enchantment: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
Sidisi, Undead Vizier84%
$8.71↑#2797↑0.35↑11.4 years↓
"When this card exploits a creature, you may search your library for a card, put it into your hand, then shuffle."
Rhystic Tutor84%
$4.72↑#134590.1226.3 years↑
"Unless any player pays 
, search your library for a card, put that card into your hand, then shuffle."
, search your library for a card, put that card into your hand, then shuffle."