Quandrix, the Proof 
Legendary Creature — Elder Dragon
$1.26 #7028 0.63 0.5 years
Flying, trample
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
Instant and sorcery spells you cast from your hand have cascade.
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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.
Maelstrom Nexus80%
$1.94↑#4917↑0.80↑17.5 years↑
"The first spell you cast each turn has cascade."
Wildsear, Scouring Maw78%
$0.52↓#3735↑0.40↓2.2 years↑
"Enchantment spells you cast from your hand have cascade."
+1 more matching line
Spellheart Chimera78%
$0.13↓#15855↓0.19↓13.1 years↑
"Flying, trample"
Smoldering Stagecoach77%
$0.31↓#16321↓0.24↓2.5 years↑
"Whenever this Vehicle attacks, the next instant spell and the next sorcery spell you cast this turn each have cascade."
Imoti, Celebrant of Bounty77%
$0.31↓#2611↑0.555.9 years↑
"Spells you cast with mana value 6 or greater have cascade."
+1 more matching line
Creative Technique76%
$0.27↓#4689↑0.12↓5.5 years↑
"Shuffle your library, then reveal cards from the top of it until you reveal a nonland card. Exile that card and put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost."
The First Sliver76%
$27.78↑#4268↑1.71↑7.4 years↑
"Sliver spells you cast have cascade."
+1 more matching line
Zhulodok, Void Gorger76%
$17.12↑#2834↑1.61↑3.2 years↑
"Colorless spells you cast from your hand with mana value 7 or greater have "Cascade, cascade.""
Yidris, Maelstrom Wielder76%
$8.56↑#9196↓1.00↑9.9 years↑
"Whenever this card deals combat damage to a player, as you cast spells from your hand this turn, they gain cascade."
+1 more matching line
Wanda's Vision76%
$4.79↑#14852↓0.42↓0.3 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."
Hydroid Krasis76%
$0.30↓#1556↑0.22↓7.7 years↑
"Flying, trample"
Wild-Magic Sorcerer74%
$5.64↑#1654↑0.38↓5.2 years↑
"The first spell you cast from exile each turn has cascade."
Dark Apostle74%
$0.39↓#12169↓0.06↓4.0 years↑
"
, 
: The next noncreature spell you cast this turn has cascade."
, : The next noncreature spell you cast this turn has cascade."
Zaffai and the Tempests73%
$0.21↓#12086↓0.26↓0.5 years
"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Flamekin Herald72%
$0.36↓#82630.38↓5.9 years↑
"Commander spells you cast have cascade."
Jodah, the Unifier72%
$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."
Gluttonous Hellkite72%
$0.29↓#11223↓0.31↓2.3 years↑
"Flying, trample"
Breaching Dragonstorm71%
$0.24↓#3812↑0.11↓1.5 years↑
"When this enchantment enters, exile cards from the top of your library until you exile a nonland card. You may cast it without paying its mana cost if that spell's mana value is 8 or less. If you don't, put that card into your hand."
The Infamous Cruelclaw71%
$1.52↑#5439↑0.532.2 years↑
"Whenever this card deals combat damage to a player, exile cards from the top of your library until you exile a nonland card. You may cast that card by discarding a card rather than paying its mana cost."
Annoyed Altisaur70%
$0.15↓#3984↑0.09↓5.9 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
+1 more matching line