Dimir Spybug 
Creature — Insect
$0.17 #13988 0.12 8.0 years
Flying
Menace (This creature can't be blocked except by two or more creatures.)
Whenever you surveil, put a +1/+1 counter on this creature.
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Cards similar to Dimir Spybug 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.
Thoughtbound Phantasm96%
$0.24↑#17202↓0.068.0 years
"Whenever you surveil, put a +1/+1 counter on this creature."
Desperate Futurescribe94%
$0.15↓#26975↓0.150.0 years↓
"Flying"
Mirko, Obsessive Theorist92%
$0.33↑#8156↑0.122.7 years↓
"Whenever you surveil, put a +1/+1 counter on this card."
Saheeli, Consul of Oversight90%
$0.17#20158↓0.050.0 years↓
"Flying"
Proft, Consulting Detective86%
$0.19↑#21344↓0.150.0 years↓
"Whenever you scry or surveil, you may pay 
. If you do, put a +1/+1 counter on this card and draw a card."
. If you do, put a +1/+1 counter on this card and draw a card."
Denzilore Fatehold85%
$3.48↑#124130.28↑0.0 years↓
"Whenever you scry or surveil, put a +1/+1 counter on each creature you control."
Markov Dreadknight83%
$0.15↓#23714↓0.0610.5 years↑
"Flying"
Stormblood Berserker82%
$0.06↓#24245↓0.00↓15.3 years↑
"Menace"
Judge Magister Gabranth82%
$0.19↑#9166↑0.25↑1.4 years↓
"Menace"
Grime Gorger79%
$0.24↑#22293↓0.124.5 years↓
"Menace"
Iron Bully79%
$0.06↓#20774↓0.067.5 years
"Menace"
Virtuous Variant79%
$0.17#28301↓0.130.3 years↓
"Flying"
Deep Goblin Skulltaker78%
$0.15↓#19093↓0.00↓2.9 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
+1 more matching line
Retaliator Griffin78%
$0.37↑#22528↓0.1217.5 years↑
"Flying"
Silumgar Scavenger78%
$0.05↓#23233↓0.197.4 years
"Flying"
Asmira, Holy Avenger78%
$1.21↑#24744↓0.1330.0 years↑
"Flying"
Gluttonous Slug78%
$0.17#20746↓0.00↓7.4 years
"Menace"
Ultron's Auxiliary78%
$0.99↑#19437↓0.120.3 years↓
"Menace"
Rushwood Elemental77%
$1.04↑#28334↓0.00↓27.0 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Tomb Robber77%
$0.18↑#21283↓0.00↓8.8 years
"Menace"