Lightning, Security Sergeant 

Legendary Creature — Human Soldier
$0.28 #10231 0.16 1.2 years
Menace (This creature can't be blocked except by two or more creatures.)
Whenever Lightning deals combat damage to a player, exile the top card of your library. You may play that card for as long as you control Lightning.
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Cards similar to Lightning, Security Sergeant 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.
Grotag Night-Runner98%
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"Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn."
Prophetic Flamespeaker98%
$0.40↑#17374↓0.1412.3 years↑
"Whenever this creature deals combat damage to a player, exile the top card of your library. You may play it this turn."
Stromkirk Occultist92%
$0.14↓#99540.58↑10.1 years↑
"Whenever this creature deals combat damage to a player, exile the top card of your library. Until end of turn, you may play that card."
Dream Pillager92%
$0.15↓#12603↓0.1210.8 years↑
"Whenever this creature deals combat damage to a player, exile that many cards from the top of your library. Until end of turn, you may cast spells from among those exiled cards."
Intet, the Dreamer88%
$0.48↑#113290.2419.6 years↑
"Whenever this card deals combat damage to a player, you may pay 
. If you do, exile the top card of your library face down. You may look at that card for as long as it remains exiled. You may play that card without paying its mana cost for as long as this card remains on the battlefield."
Araña, Heart of the Spider86%
$0.64↑#5735↑0.38↑1.0 years
"Whenever a modified creature you control deals combat damage to a player, exile the top card of your library. You may play that card this turn."
Capricious Sliver84%
$0.60↑#13381↓0.69↑3.1 years↑
"Sliver creatures you control have "Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn.""
Moria Marauder83%
$0.50↑#5354↑0.213.2 years↑
"Whenever a Goblin or Orc you control deals combat damage to a player, exile the top card of your library. You may play that card this turn."
Feldon, Ronom Excavator82%
$0.27↓#17082↓0.60↑3.8 years↑
"Whenever this card is dealt damage, exile that many cards from the top of your library. Choose one of them. Until the end of your next turn, you may play that card."
Count on Luck81%
$0.46↑#4287↑0.211.6 years
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."
Sword of Forge and Frontier80%
$7.96↑#1878↑0.42↑3.6 years↑
"Whenever equipped creature deals combat damage to a player, exile the top two cards of your library. You may play those cards this turn. You may play an additional land this turn."
Thor, Guardian of Midgard80%
$2.57↑#18053↓0.00↓0.2 years↓
"Whenever a source you control deals noncombat damage to an opponent, you may exile that many cards from the top of your library. You may play those cards this turn."
Stick, Fearless Mentor80%
$0.34↑#20555↓0.00↓0.2 years↓
"Whenever a source you control deals damage to you, exile the top card of your library. You may play it until the end of your next turn. This ability triggers only once each turn."
Syr Carah, the Bold80%
$0.22↓#14244↓0.60↑6.9 years↑
"Whenever this card or an instant or sorcery spell you control deals damage to a player, exile the top card of your library. You may play that card this turn."
Rotisserie Elemental80%
$0.20↓#16999↓0.35↑3.0 years↑
"Whenever this creature deals combat damage to a player, put a skewer counter on this creature. Then you may sacrifice it. If you do, exile the top X cards of your library, where X is the number of skewer counters on this creature. You may play those cards this turn."
+1 more matching line
Expedited Inheritance80%
$0.27↓#119910.44↑2.6 years↑
"Whenever a creature is dealt damage, its controller may exile that many cards from the top of their library. They may play those cards until the end of their next turn."
Yasmin Khan79%
$0.24↓#15521↓0.76↑2.9 years↑
"
: Exile the top card of your library. Until your next end step, you may play it."