Monstrous Vortex 
Enchantment
$0.34 #2189 0.45 2.3 years
Whenever you cast a creature spell with power 5 or greater, discover X, where X is that spell's mana value. (Exile cards from the top of your library until you exile a nonland card with that mana value 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 Monstrous Vortex 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.
Franklin Richards, Ascendant77%
$0.24↓#14117↓0.33↓0.3 years↓
"At the beginning of combat on your turn, if you've cast a noncreature spell this turn, discover 6."
Brass's Tunnel-Grinder // Tecutlan, the Searing Rift75%
$2.69↑#1606↑0.24↓2.9 years
"Whenever you cast a permanent spell using mana produced by this card, discover X, where X is that spell's mana value."
Chimil, the Inner Sun74%
$7.85↑#743↑0.73↑2.9 years
"At the beginning of your end step, discover 5."
Geological Appraiser74%
$0.20↓#13526↓0.472.9 years
"When this creature enters, if you cast it, discover 3."
Ellie and Alan, Paleontologists74%
$5.87↑#14831↓0.532.9 years
"
, Exile a creature card from your graveyard: Discover X, where X is the mana value of the exiled card. Activate only as a sorcery."
, Exile a creature card from your graveyard: Discover X, where X is the mana value of the exiled card. Activate only as a sorcery."
Curator of Sun's Creation73%
$0.23↓#11048↓0.00↓2.9 years
"Whenever you discover, discover again for the same value. This ability triggers only once each turn."
Rashmi, Eternities Crafter72%
$0.39↑#3664↓0.4210.1 years↑
"Whenever you cast your first spell each turn, reveal the top card of your library. You may cast it without paying its mana cost if it's a spell with lesser mana value. If you don't cast it, put it into your hand."
Aloy, Savior of Meridian70%
$4.56↑#10574↓0.421.0 years↓
"Whenever one or more artifact creatures you control attack, discover X, where X is the greatest power among them."
Jodah, the Unifier70%
$2.28↑#2878↓1.86↑4.1 years↑
"Whenever you cast a legendary spell from your hand, exile cards from the top of your library until you exile a legendary nonland card with lesser mana value. You may cast that card without paying its mana cost. Put the rest on the bottom of your library in a random order."
Daring Discovery70%
$0.25↓#11754↓0.00↓2.9 years
"Discover 4."