Grim Flayer 
Creature — Human Warrior
$0.21 #10949 0.05 10.1 years
Trample
Whenever this creature deals combat damage to a player, surveil 3. (Look at the top three cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
Delirium — This creature gets +2/+2 as long as there are four or more card types among cards in your graveyard.
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Cards similar to Grim Flayer 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.
Think Tank91%
$0.24↑#20562↓0.0024.9 years↑
"At the beginning of your upkeep, surveil 1."
Foul Watcher90%
$0.15↓#21337↓0.29↑5.2 years↓
"This creature gets +1/+0 as long as there are four or more card types among cards in your graveyard."
+1 more matching line
Sultai Ascendancy90%
$0.31↑#90900.34↑11.9 years↑
"At the beginning of your upkeep, surveil 2."
Naga Oracle90%
$0.09↓#27987↓0.46↑9.4 years
"When this creature enters, surveil 3."
Taigam's Scheming88%
$0.05↓#14890↓0.0411.9 years↑
"Surveil 5."
Contingency Plan88%
$0.18↓#122010.0010.1 years
"Surveil 5."
Curate88%
$0.18↓#4715↑0.115.4 years↓
"Surveil 2."
Gnarlwood Dryad86%
$0.27↑#8601↑0.0010.1 years
"This creature gets +2/+2 as long as there are four or more card types among cards in your graveyard."
Moldgraf Scavenger86%
$0.05↓#26841↓0.0010.4 years
"This creature gets +3/+0 as long as there are four or more card types among cards in your graveyard."
Rummaging Wizard86%
$0.12↓#31490↓0.22↑23.9 years↑
"
: Surveil 1."
: Surveil 1."
Otherworldly Gaze85%
$0.31↑#2526↑0.144.9 years↓
"Surveil 3."
Broodspinner84%
$0.26↑#104270.17↑1.9 years↓
"When this creature enters, surveil 2."
Jenny, Generated Anomaly84%
$0.28↑#18926↓0.002.9 years↓
"Whenever this card deals combat damage to a player, it explores."
Emperor's Vanguard84%
$0.18↓#25146↓0.29↑8.9 years↓
"Whenever this creature deals combat damage to a player, it explores."
Etherwrought Page82%
$0.21#24354↓0.0017.3 years↑
"• Surveil 1."
Basilica Stalker82%
$0.10↓#21722↓0.002.6 years↓
"Whenever this creature deals combat damage to a player, you gain 1 life and surveil 1."
Titans' Nest82%
$0.34↑#98320.106.4 years↓
"At the beginning of your upkeep, surveil 1."
Uurg, Spawn of Turg80%
$0.16↓#7840↑0.17↑4.0 years↓
"At the beginning of your upkeep, surveil 1."
+1 more matching line
Desperate Sentry80%
$0.09↓#25623↓0.50↑10.1 years
"This creature gets +3/+0 as long as there are four or more card types among cards in your graveyard."
Cruel Witness80%
$0.08↓#18773↓0.38↑4.8 years↓
"Whenever you cast a noncreature spell, surveil 1."