Capricious Sliver 

Creature — Sliver
$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."
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Cards similar to Capricious Sliver 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-Runner86%
$0.11↓#20898↓0.00↓5.9 years↑
"Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn."
Prophetic Flamespeaker86%
$0.40↓#17374↓0.14↓12.3 years↑
"Whenever this creature deals combat damage to a player, exile the top card of your library. You may play it this turn."
Lightning, Security Sergeant84%
$0.28↓#10231↑0.16↓1.2 years↓
"Whenever this card deals combat damage to a player, exile the top card of your library. You may play that card for as long as you control this card."
Dream Pillager80%
$0.15↓#126030.12↓10.8 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."
Stromkirk Occultist78%
$0.14↓#9954↑0.58↓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."
Araña, Heart of the Spider77%
$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."
Moria Marauder76%
$0.50↓#5354↑0.21↓3.2 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."
Synapse Sliver74%
$3.83↑#5789↑0.6523.6 years↑
"Whenever a Sliver deals combat damage to a player, its controller may draw a card."
Tempered Sliver73%
$0.29↓#114360.31↓7.2 years↑
"Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.""
Intet, the Dreamer73%
$0.48↓#113290.24↓19.6 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."
Brood Sliver72%
$5.02↑#5229↑0.39↓23.6 years↑
"Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token."
Sword of Forge and Frontier70%
$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."
Count on Luck70%
$0.46↓#4287↑0.21↓1.6 years↓
"At the beginning of your upkeep, exile the top card of your library. You may play that card this turn."