Think Tank 
Enchantment
$0.23 #20870 0.10 25.1 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%
$0.33↑#9316↑0.00↓12.1 years↓
"At the beginning of your upkeep, surveil 2."
Titans' Nest95%
$0.25↑#9983↑0.116.5 years↓
"At the beginning of your upkeep, surveil 1."
Rummaging Wizard94%
$0.11↓#31702↓0.00↓24.0 years↓
": Surveil 1."
: Surveil 1."
Uurg, Spawn of Turg94%
$0.20↓#7900↑0.124.1 years↓
"At the beginning of your upkeep, surveil 1."
Naga Oracle93%
$0.09↓#28243↓0.129.5 years↓
"When this creature enters, surveil 3."
Curate92%
$0.15↓#4738↑0.055.5 years↓
"Surveil 2."
Contingency Plan92%
$0.17↓#12244↑0.0610.2 years↓
"Surveil 5."
Taigam's Scheming92%
$0.05↓#15098↑0.0612.1 years↓
"Surveil 5."
Grim Flayer92%
$0.21↓#11440↑0.00↓10.2 years↓
"Whenever this creature deals combat damage to a player, surveil 3."
Etherwrought Page91%
$0.22↓#245450.0617.5 years↓
"• Surveil 1."
Sinister Starfish90%
$0.10↓#9225↑0.00↓5.3 years↓
"
: Surveil 1."
: Surveil 1."
Cruel Witness90%
$0.20↓#188000.064.9 years↓
"Whenever you cast a noncreature spell, surveil 1."
Wretched Doll90%
$0.14↓#213470.061.7 years↓
"
, : Surveil 1."
, : Surveil 1."
Otherworldly Gaze90%
$0.31↑#2493↑0.045.1 years↓
"Surveil 3."
Rune-Sealed Wall88%
$0.24↑#10579↑0.00↓1.9 years↓
": Surveil 1."
: Surveil 1."
Sanguine Spy86%
$0.25↑#13924↑0.194.5 years↓
"
, Sacrifice another creature: Surveil 1."
, Sacrifice another creature: Surveil 1."
Appendage Amalgam86%
$0.17↓#14094↑0.00↓2.1 years↓
"Whenever this creature attacks, surveil 1."
Fear of Surveillance86%
$0.24↑#12215↑0.00↓2.1 years↓
"Whenever this creature attacks, surveil 1."
Nightveil Sprite86%
$0.14↓#6901↑0.00↓8.0 years↓
"Whenever this creature attacks, surveil 1."
Il Mheg Pixie86%
$0.20↓#10983↑0.21↑1.4 years↓
"Whenever this creature attacks, surveil 1."