Archghoul of Thraben 
Creature — Zombie Cleric
$0.23 #6143 0.05 4.8 years
Whenever this creature or another Zombie you control dies, look at the top card of your library. If it's a Zombie card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard.
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Cards similar to Archghoul of Thraben 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.
Traveling Botanist73%
$0.20↓#14769↓0.24↑1.4 years↓
"Whenever this creature becomes tapped, look at the top card of your library. If it's a land card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard."
Undead Augur72%
$0.13↓#1842↑0.19↑7.2 years↑
"Whenever this creature or another Zombie you control dies, you draw a card and you lose 1 life."
Gathering Stone72%
$0.59↑#3375↑0.000.6 years↓
"When this artifact enters and at the beginning of your upkeep, look at the top card of your library. If it's a card of the chosen type, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard."
Sarinth Steelseeker72%
$0.19↓#49870.27↑3.8 years
"Whenever an artifact you control enters, look at the top card of your library. If it's a land card, you may reveal it and put it into your hand. If you don't put the card into your hand, you may put it into your graveyard."
Headless Rider70%
$1.14↑#2855↑0.154.8 years
"Whenever this creature or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token."