Foul Watcher 
Creature — Nightmare Bird
$0.15 #21337 0.29 5.2 years
Flying
When this creature enters, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
Delirium — This creature gets +1/+0 as long as there are four or more card types among cards in your graveyard.
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Cards similar to Foul Watcher 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.
Broodspinner96%
$0.26↑#10427↑0.17↓1.9 years↓
"When this creature enters, surveil 2."
Moldgraf Scavenger92%
$0.05↓#26841↓0.00↓10.4 years↑
"This creature gets +3/+0 as long as there are four or more card types among cards in your graveyard."
Gnarlwood Dryad92%
$0.27↑#8601↑0.00↓10.1 years↑
"This creature gets +2/+2 as long as there are four or more card types among cards in your graveyard."
Shore Lurker92%
$0.09↓#247200.00↓0.6 years↓
"When this creature enters, surveil 1."
Wreckage Wickerfolk92%
$0.21↑#14160↑0.15↓1.6 years↓
"When this creature enters, surveil 2."
Watcher in the Mist92%
$0.05↓#28012↓0.00↓7.9 years↑
"When this creature enters, surveil 2."
Sanitation Automaton91%
$0.08↓#223250.18↓2.6 years↓
"When this creature enters, surveil 1."
Whisper Agent91%
$0.07↓#238600.43↑7.9 years↑
"When this creature enters, surveil 1."
Grim Flayer90%
$0.21↑#10949↑0.05↓10.1 years↑
"This creature gets +2/+2 as long as there are four or more card types among cards in your graveyard."
+1 more matching line
Dimir Informant90%
$0.15#242400.00↓7.9 years↑
"When this creature enters, surveil 2."
Imperious Inkmage90%
$0.05↓#254190.00↓0.4 years↓
"When this creature enters, surveil 2."
A.I.M. Synthoids90%
$0.11↓#203190.00↓0.2 years↓
"When this creature enters, surveil 2."
Sterling Hound90%
$0.17↑#172780.07↓2.4 years↓
"When this creature enters, surveil 2."
Barrier of Bones88%
$0.08↓#15150↑0.00↓7.9 years↑
"When this creature enters, surveil 1."
Siren Lookout86%
$0.21↑#207510.00↓8.9 years↑
"When this creature enters, it explores."
Dire Fleet Interloper86%
$0.25↑#248760.50↑8.9 years↑
"When this creature enters, it explores."
Autumnal Gloom // Ancient of the Equinox86%
$0.13↓#245510.43↑10.4 years↑
"At the beginning of your end step, if there are four or more card types among cards in your graveyard, transform this enchantment."
Dragon's Rage Channeler86%
$0.99↑#1818↑0.18↓5.2 years
"As long as there are four or more card types among cards in your graveyard, this creature gets +2/+2, has flying, and attacks each combat if able."
+1 more matching line
Underwater Tunnel // Slimy Aquarium86%
$0.18↑#11106↑0.17↓1.9 years↓
"When you unlock this door, surveil 2."
Emissary of Sunrise86%
$0.11↓#27663↓0.228.9 years↑
"When this creature enters, it explores."