Monstrous Vortex 
Enchantment
$0.36 #2173 0.45 2.2 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, Ascendant78%
$0.28↓#15365↓0.00↓0.2 years↓
"At the beginning of combat on your turn, if you've cast a noncreature spell this turn, discover 6."
Chimil, the Inner Sun76%
$9.64↑#759↑0.74↑2.8 years
"At the beginning of your end step, discover 5."
Geological Appraiser76%
$0.29↓#13223↓0.62↑2.8 years
"When this creature enters, if you cast it, discover 3."
Brass's Tunnel-Grinder // Tecutlan, the Searing Rift76%
$3.33↑#1565↑0.20↓2.8 years
"Whenever you cast a permanent spell using mana produced by Tecutlan, discover X, where X is that spell's mana value."
Ellie and Alan, Paleontologists76%
$7.46↑#14511↓0.73↑2.8 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 Creation74%
$0.28↓#11184↓0.422.8 years
"Whenever you discover, discover again for the same value. This ability triggers only once each turn."
Rashmi, Eternities Crafter74%
$0.39↑#3551↓0.25↓9.9 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 Meridian72%
$5.75↑#10655↓0.00↓0.9 years↓
"Whenever one or more artifact creatures you control attack, discover X, where X is the greatest power among them."
Jodah, the Unifier72%
$2.98↑#2856↓1.94↑4.0 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 Discovery72%
$0.28↓#11602↓0.08↓2.8 years
"Discover 4."
Hit the Mother Lode72%
$0.33↓#18130.29↓2.8 years
"Discover 10. If the discovered card's mana value is less than 10, create a number of tapped Treasure tokens equal to the difference."
Imoti, Celebrant of Bounty70%
$0.28↓#25470.515.8 years↑
"Spells you cast with mana value 6 or greater have cascade."
Etali's Favor70%
$0.32↓#6884↓0.24↓2.8 years
"When this Aura enters, discover 3."
Primordial Gnawer70%
$0.11↓#19932↓0.392.8 years
"When this creature dies, discover 3."
Sunbird's Invocation70%
$0.25↓#18850.32↓8.9 years↑
"Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost. Put the rest on the bottom of your library in a random order."
Sweet-Gum Recluse70%
$0.42↑#4952↓0.12↓5.8 years↑
"Cascade"
Wanda's Vision70%
$4.40↑#15929↓0.00↓0.2 years↓
"Whenever you cast your second spell each turn, exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost."