Grim Javelineer 

Creature — Human Warrior
$0.06 #26854 0.25 1.7 years
Whenever you attack, target attacking creature gets +1/+0 until end of turn. When that creature dies this turn, 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 Grim Javelineer 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.
Clandestine Meddler78%
$0.04↓#248490.00↓2.7 years↑
"Whenever one or more suspected creatures you control attack, surveil 1."
Spider-Man Noir78%
$0.24↑#8845↑0.06↓1.1 years
"Whenever a creature you control attacks alone, put a +1/+1 counter on it. Then surveil X, where X is the number of counters on it."
Candlestick78%
$0.23↑#12377↑0.00↓2.7 years↑
"Equipped creature gets +1/+1 and has "Whenever this creature attacks, surveil 2.""
Vanguard Seraph77%
$0.17↑#10496↑0.10↓1.9 years
"Whenever you gain life for the first time each turn, surveil 1."
Dimir Strandcatcher76%
$0.84↑#16738↑0.06↓2.7 years
"Whenever you attack, surveil X, where X is the number of opponents being attacked."
Seer of Stolen Sight76%
$0.29↑#20977↑0.06↓3.5 years↑
"Whenever one or more artifacts and/or creatures you control are put into a graveyard from the battlefield, surveil 1."
Gift of Compleation74%
$0.12↑#14566↑0.06↓3.5 years↑
"Whenever a Phyrexian you control dies, surveil 1."
MACH-1, Swooping Scoundrel74%
$0.26↑#258460.270.3 years↓
"When this card enters and whenever you gain life, surveil 1. This ability triggers only once each turn."
Unwelcome Sprite74%
$0.22↑#12804↑0.04↓0.7 years
"Whenever you cast a spell during an opponent's turn, surveil 2."
Wary Farmer74%
$0.10↑#19470↑0.02↓0.7 years
"At the beginning of your end step, if another creature entered the battlefield under your control this turn, surveil 1."
Marauding Sphinx72%
$0.17↑#18210↑0.43↑2.5 years
"Whenever you commit a crime, surveil 2. This ability triggers only once each turn."