Gibbering Fiend 
Creature — Devil
$0.28 #13671 0.38 10.4 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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+1 more matching line
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"this card deals 3 damage to each opponent."
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$0.17↓#136770.00↓17.3 years↑
"this card deals 5 damage to each opponent."
Panicked Altisaur82%
$0.18↓#136390.07↓2.8 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Gouged Zealot80%
$0.08↓#27593↓0.27↓5.2 years↓
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Lasting Tarfire80%
$0.25↓#6536↑0.00↓0.6 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%
$0.25↓#6514↑0.14↓5.1 years↓
"When this creature enters, it deals 4 damage to each opponent."
Soul Swallower79%
$0.22↓#16838↓0.2910.4 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%
$0.20↓#8782↑0.19↓1.9 years↓
"At the beginning of your end step, this Room deals 1 damage to each opponent."
Obsessive Skinner78%
$0.18↓#141060.21↓10.4 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↓#25459↓0.4710.5 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↓#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 Scavenger76%
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"This creature gets +3/+0 as long as there are four or more card types among cards in your graveyard."
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"When this Vehicle enters, it deals 4 damage to each opponent."
Topplegeist76%
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"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%
$0.07↓#25213↓0.00↓7.6 years↓
"When this creature enters, it deals 2 damage to each opponent and you gain 2 life."
Teapot Slinger76%
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"Whenever you expend 4, this creature deals 2 damage to each opponent."
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