Dragon's Rage Channeler 
Creature — Human Shaman
$0.99 #1818 0.18 5.2 years
Whenever you cast a noncreature spell, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
Delirium — 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.
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Cards similar to Dragon's Rage Channeler 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.
Foul Watcher86%
$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
Cruel Witness84%
$0.08↓#18773↓0.38↑4.8 years
"Whenever you cast a noncreature spell, surveil 1."
H.E.R.B.I.E., Lovable Robot82%
$0.37↓#12914↓0.00↓0.2 years↓
"At the beginning of combat on your turn, if you've cast a noncreature spell this turn, surveil 1."
Garland, Knight of Cornelia // Chaos, the Endless80%
$0.24↓#11711↓0.32↑1.2 years↓
"Whenever you cast a noncreature spell, surveil 1."
Moorland Drifter80%
$0.06↓#30972↓0.00↓10.4 years↑
"This creature has flying as long as there are four or more card types among cards in your graveyard."
Unwelcome Sprite78%
$0.24↓#13443↓0.00↓0.6 years↓
"Whenever you cast a spell during an opponent's turn, surveil 2."
Broodspinner78%
$0.26↓#10427↓0.171.9 years↓
"When this creature enters, surveil 2."
+1 more matching line
Gnarlwood Dryad76%
$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."
Moldgraf Scavenger75%
$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."
Lightshell Duo74%
$0.09↓#10334↓0.00↓2.1 years↓
"When this creature enters, surveil 2."
Grim Flayer74%
$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
Rune-Sealed Wall74%
$0.21↓#10811↓0.06↓1.8 years↓
"
: Surveil 1."
: Surveil 1."
Sinister Starfish74%
$0.18↓#9367↓0.00↓5.2 years
": Surveil 1."
: Surveil 1."
Case of the Shifting Visage73%
$0.33↓#8997↓0.42↑2.6 years↓
"At the beginning of your upkeep, surveil 1."
Autumnal Gloom // Ancient of the Equinox73%
$0.13↓#24551↓0.43↑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."
Wretched Doll72%
$0.15↓#21195↓0.181.6 years↓
"
, : Surveil 1."
, : Surveil 1."
Whisper Agent72%
$0.07↓#23860↓0.43↑7.9 years↑
"When this creature enters, surveil 1."
Shore Lurker72%
$0.09↓#24720↓0.00↓0.6 years↓
"When this creature enters, surveil 1."
Sanitation Automaton72%
$0.08↓#22325↓0.182.6 years↓
"When this creature enters, surveil 1."
Barrier of Bones72%
$0.08↓#15150↓0.00↓7.9 years↑
"When this creature enters, surveil 1."