Primordial Gnawer 
Creature — Insect Horror
$0.11 #19932 0.39 2.8 years
When this creature dies, discover 3. (Exile cards from the top of your library until you exile a nonland card with mana value 3 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)
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Cards similar to Primordial Gnawer 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.
Digsite Conservator96%
$0.10↓#191880.312.8 years
"When this creature dies, you may pay . If you do, discover 4."
. If you do, discover 4."
Zoetic Glyph94%
$0.19↑#180040.412.8 years
"When this Aura is put into a graveyard from the battlefield, discover 3."
Dinosaur Egg92%
$0.42↑#5725↑0.18↓2.8 years
"When this creature dies, you may discover X, where X is its toughness."
Treasure Keeper86%
$0.12↑#10819↑0.04↓9.6 years↑
"When this creature dies, reveal cards from the top of your library until you reveal a nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order."
Daring Discovery86%
$0.28↑#11602↑0.08↓2.8 years
"Discover 4."
Geological Appraiser84%
$0.29↑#13223↑0.62↑2.8 years
"When this creature enters, if you cast it, discover 3."
Etali's Favor82%
$0.32↑#6884↑0.24↓2.8 years
"When this Aura enters, discover 3."
Chimil, the Inner Sun80%
$9.64↑#759↑0.74↑2.8 years
"At the beginning of your end step, discover 5."
Trumpeting Carnosaur80%
$1.60↑#1638↑0.322.8 years
"When this creature enters, discover 5."
Buried Treasure78%
$0.21↑#13706↑0.00↓2.8 years
"
, Exile this card from your graveyard: Discover 5. Activate only as a sorcery."
, Exile this card from your graveyard: Discover 5. Activate only as a sorcery."
Enigma Sphinx78%
$0.26↑#14043↑0.50↑17.3 years↑
"When this creature is put into your graveyard from the battlefield, put it into your library third from the top."
Sweet-Gum Recluse77%
$0.42↑#4952↑0.12↓5.8 years↑
"Cascade"
Hidden Cataract76%
$0.17↑#5175↑0.08↓2.8 years
"
, 
, Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Courtyard76%
$0.26↑#5550↑0.09↓2.8 years
"
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Necropolis76%
$0.19↑#5786↑0.01↓2.8 years
", , Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Nursery76%
$0.21↑#3592↑0.05↓2.8 years
"
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Volcano76%
$0.16↑#3887↑0.08↓2.8 years
"
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Long-Range Sensor74%
$0.27↑#5160↑0.04↓1.1 years↓
"
, Remove two charge counters from this artifact: Discover 4. Activate only as a sorcery."
, Remove two charge counters from this artifact: Discover 4. Activate only as a sorcery."
Curator of Sun's Creation71%
$0.28↑#11184↑0.422.8 years
"Whenever you discover, discover again for the same value. This ability triggers only once each turn."
Byway Courier70%
$0.04↓#27202↓0.00↓10.4 years↑
"When this creature dies, investigate."