Grim Javelineer 

Creature — Human Warrior
$0.05 #26602 0.23 1.6 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.
Spider-Man Noir76%
$0.28↑#9010↑0.211.0 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."
Clandestine Meddler76%
$0.06↑#245960.07↓2.6 years↑
"Whenever one or more suspected creatures you control attack, surveil 1."
Candlestick76%
$0.24↑#12423↑0.232.6 years↑
"Equipped creature gets +1/+1 and has "Whenever this creature attacks, surveil 2.""
Dimir Strandcatcher74%
$0.90↑#16427↑0.13↓2.5 years
"Whenever you attack, surveil X, where X is the number of opponents being attacked."