Gibbering Fiend 
Creature — Devil
$0.32 #14086 0.00 10.5 years
When this creature enters, it deals 1 damage to each opponent.
Delirium — At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, this creature deals 1 damage to that player.
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Cards similar to Gibbering Fiend 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.
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+1 more matching line
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Panicked Altisaur82%
$0.16↓#140770.33↑2.9 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Gouged Zealot80%
$0.07↓#28125↓0.12↑5.3 years↓
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$0.24↓#6199↑0.14↑0.7 years↓
"At the beginning of each end step, if you put a counter on a creature this turn, this enchantment deals 2 damage to each opponent."
Red Dragon80%
$0.32#6639↑0.005.2 years↓
"When this creature enters, it deals 4 damage to each opponent."
Soul Swallower80%
$0.25↓#17331↓0.20↑10.5 years
"At the beginning of your upkeep, if there are four or more card types among cards in your graveyard, put three +1/+1 counters on this creature."
Glassworks // Shattered Yard78%
$0.15↓#9462↑0.11↑2.1 years↓
"At the beginning of your end step, this Room deals 1 damage to each opponent."
Obsessive Skinner76%
$0.22↓#146120.12↑10.5 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, put a +1/+1 counter on target creature."
Tooth Collector76%
$0.05↓#25910↓0.18↑10.6 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, target creature that player controls gets -1/-1 until end of turn."
Gnarlwood Dryad76%
$0.27↓#8839↑0.0010.2 years
"This creature gets +2/+2 as long as there are four or more card types among cards in your graveyard."
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$0.22↓#9751↑0.14↑10.6 years
"At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, tap target creature that player controls."
Grasping Thrull76%
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"When this creature enters, it deals 2 damage to each opponent and you gain 2 life."
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"Whenever you expend 4, this creature deals 2 damage to each opponent."
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