Think Tank 
Enchantment
$0.24 #20562 0.00 24.9 years
At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
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Cards similar to Think Tank 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.
Sultai Ascendancy100%
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"At the beginning of your upkeep, surveil 2."
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"When this creature enters, surveil 3."
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": Surveil 1."
: Surveil 1."
Taigam's Scheming94%
$0.05↓#14890↑0.0411.9 years↓
"Surveil 5."
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$0.18↓#12201↑0.0010.1 years↓
"Surveil 5."
Curate94%
$0.18↓#4715↑0.11↑5.4 years↓
"Surveil 2."
Titans' Nest94%
$0.34↑#9832↑0.10↑6.4 years↓
"At the beginning of your upkeep, surveil 1."
Otherworldly Gaze92%
$0.31↑#2526↑0.14↑4.9 years↓
"Surveil 3."
Uurg, Spawn of Turg92%
$0.16↓#7840↑0.17↑4.0 years↓
"At the beginning of your upkeep, surveil 1."
Grim Flayer91%
$0.21↓#10949↑0.0510.1 years↓
"Whenever this creature deals combat damage to a player, surveil 3."
Etherwrought Page90%
$0.21↓#243540.0017.3 years↓
"• Surveil 1."
Cruel Witness90%
$0.08↓#187730.38↑4.8 years↓
"Whenever you cast a noncreature spell, surveil 1."
Whisper Agent88%
$0.07↓#238600.43↑7.9 years↓
"When this creature enters, surveil 1."
Sanitation Automaton88%
$0.08↓#223250.18↑2.6 years↓
"When this creature enters, surveil 1."
Shore Lurker88%
$0.09↓#24720↓0.000.6 years↓
"When this creature enters, surveil 1."
Sinister Starfish88%
$0.18↓#9367↑0.005.2 years↓
"
: Surveil 1."
: Surveil 1."
Dimir Informant88%
$0.15↓#242400.007.9 years↓
"When this creature enters, surveil 2."
Imperious Inkmage88%
$0.05↓#25419↓0.000.4 years↓
"When this creature enters, surveil 2."
A.I.M. Synthoids88%
$0.11↓#203190.000.2 years↓
"When this creature enters, surveil 2."
Sterling Hound88%
$0.17↓#172780.072.4 years↓
"When this creature enters, surveil 2."