Primordial Gnawer 
Creature — Insect Horror
$0.18 #20518 0.36 2.9 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%
$0.16↓#195750.24↓2.9 years
"When this creature dies, you may pay . If you do, discover 4."
. If you do, discover 4."
Zoetic Glyph94%
$0.19↑#183560.00↓2.9 years
"When this Aura is put into a graveyard from the battlefield, discover 3."
Dinosaur Egg92%
$0.52↑#5778↑0.05↓2.9 years
"When this creature dies, you may discover X, where X is its toughness."
Treasure Keeper86%
$0.16↓#11102↑0.25↓9.7 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%
$0.25↑#11754↑0.00↓2.9 years
"Discover 4."
Geological Appraiser84%
$0.20↑#13526↑0.47↑2.9 years
"When this creature enters, if you cast it, discover 3."
Etali's Favor82%
$0.27↑#7061↑0.272.9 years
"When this Aura enters, discover 3."
Chimil, the Inner Sun80%
$7.85↑#743↑0.73↑2.9 years
"At the beginning of your end step, discover 5."
Trumpeting Carnosaur80%
$1.88↑#1659↑0.282.9 years
"When this creature enters, discover 5."
Buried Treasure78%
$0.24↑#13918↑0.00↓2.9 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%
$0.29↑#10947↑0.17↓17.5 years↑
"When this creature is put into your graveyard from the battlefield, put it into your library third from the top."
Hidden Cataract76%
$0.19↑#5384↑0.09↓2.9 years
"
, 
, Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Courtyard76%
$0.20↑#5733↑0.00↓2.9 years
"
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Necropolis76%
$0.18#6014↑0.04↓2.9 years
", , Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Nursery76%
$0.16↓#3753↑0.07↓2.9 years
"
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Hidden Volcano76%
$0.15↓#4009↑0.09↓2.9 years
"
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
, , Sacrifice this land: Discover 4. Activate only as a sorcery."
Long-Range Sensor74%
$0.26↑#4970↑0.00↓1.2 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."
Sweet-Gum Recluse73%
$0.44↑#5067↑0.06↓5.9 years↑
"Cascade"
Byway Courier70%
$0.03↓#27501↓0.05↓10.5 years↑
"When this creature dies, investigate."
Clattering Skeletons70%
$0.16↓#192470.07↓5.2 years↑
"When this creature dies, venture into the dungeon."