They Came from the Pipes 
Enchantment
$0.33 #5779 0.00 2.1 years
When this enchantment enters, manifest dread twice. (To manifest dread, look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)
Whenever a face-down creature you control enters, draw a card.
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Cards similar to They Came from the Pipes 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.
Kadena, Slinking Sorcerer90%
$0.44↑#12555↓0.22↑7.2 years↑
"Whenever a face-down creature you control enters, draw a card."
Threats Around Every Corner80%
$0.28↓#60190.10↑2.1 years
"When this enchantment enters, manifest dread."
Glitch Interpreter78%
$0.25↓#10517↓0.002.1 years
"When this creature enters, if you control no face-down permanents, return this creature to its owner's hand and manifest dread."
+1 more matching line
Soul of the Harvest77%
$1.65↑#1652↑0.25↑14.5 years↑
"Whenever another nontoken creature you control enters, you may draw a card."
Secret Plans77%
$0.21↓#9200↓0.0612.1 years↑
"Whenever a permanent you control is turned face up, draw a card."
Unsettling Twins76%
$0.12↓#19194↓0.002.1 years
"When this creature enters, manifest dread."
The Blue Spirit76%
$1.31↑#7298↓0.33↑0.9 years↓
"Whenever a nontoken creature you control enters during combat, draw a card."
Oblivious Bookworm76%
$0.18↓#13106↓0.002.1 years
"At the beginning of your end step, you may draw a card. If you do, discard a card unless a permanent entered the battlefield face down under your control this turn or you turned a permanent face up this turn."
Kaust, Eyes of the Glade74%
$0.20↓#17276↓0.29↑2.7 years
"Whenever a creature you control that was turned face up this turn deals combat damage to a player, draw a card."
Yarus, Roar of the Old Gods73%
$0.17↓#12248↓0.21↑2.7 years
"Whenever one or more face-down creatures you control deal combat damage to a player, draw a card."
Venomized Cat72%
$0.16↓#12946↓0.001.1 years
"When this creature enters, mill two cards."
Screeching Skaab72%
$0.05↓#23833↓0.21↑14.7 years↑
"When this creature enters, mill two cards."
Sultai Skullkeeper72%
$0.03↓#28404↓0.11↑11.7 years↑
"When this creature enters, mill two cards."
Wailing Ghoul72%
$0.10↓#19844↓0.0010.2 years↑
"When this creature enters, mill two cards."
Venomous Hierophant72%
$0.09↓#21775↓0.066.7 years↑
"When this creature enters, mill three cards."
Necromancer's Assistant72%
$0.03↓#23347↓0.0012.3 years↑
"When this creature enters, mill three cards."
Excavation Mole72%
$0.11↓#26255↓0.006.5 years↑
"When this creature enters, mill three cards."
Deathcap Marionette72%
$0.23↓#11226↓0.002.9 years
"When this creature enters, you may mill two cards."
Mineshaft Spider72%
$0.18↓#20116↓0.002.9 years
"When this creature enters, you may mill two cards."
Tocasia's Welcome72%
$1.40↑#817↑0.16↑3.9 years↑
"Whenever one or more creatures you control with mana value 3 or less enter, draw a card. This ability triggers only once each turn."