Flamekin Herald 
Creature — Elemental Wizard
$0.35 #8255 0.07 5.8 years
Commander spells you cast have cascade. (Whenever you cast a commander, exile cards from the top of your library until you exile a nonland card with lesser mana value. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
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Cards similar to Flamekin Herald 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.
Maelstrom Nexus89%
$2.18↑#4815↑0.61↑17.3 years↑
"The first spell you cast each turn has cascade."
Wild-Magic Sorcerer79%
$5.99↑#1640↑0.33↑5.1 years
"The first spell you cast from exile each turn has cascade."
The First Sliver78%
$29.55↑#4200↑1.66↑7.2 years↑
"Sliver spells you cast have cascade."
Wildsear, Scouring Maw78%
$0.51↑#3522↑0.46↑2.1 years↓
"Enchantment spells you cast from your hand have cascade."
Yidris, Maelstrom Wielder76%
$9.71↑#90240.57↑9.8 years↑
"Whenever this card deals combat damage to a player, as you cast spells from your hand this turn, they gain cascade."
Imoti, Celebrant of Bounty76%
$0.28↓#2547↑0.51↑5.8 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."
Zhulodok, Void Gorger73%
$19.03↑#2870↑1.37↑3.1 years↓
"Colorless spells you cast from your hand with mana value 7 or greater have "Cascade, cascade.""
Quandrix, the Proof73%
$2.00↑#75940.000.4 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."
Sweet-Gum Recluse72%
$0.42↑#4952↑0.125.8 years
"Cascade"
Dark Apostle70%
$0.36↑#11868↓0.50↑3.9 years↓
"
, 
: The next noncreature spell you cast this turn has cascade."
, : The next noncreature spell you cast this turn has cascade."
Maelstrom Colossus70%
$0.34↓#4503↑0.38↑5.8 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."
Boarding Party70%
$0.25↓#78170.005.8 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."
Shardless Agent70%
$0.34↓#73780.0014.3 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."
Bloodbraid Elf70%
$0.15↓#4839↑0.32↑17.3 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."
Annoyed Altisaur70%
$0.20↓#3970↑0.21↑5.8 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."
Enlisted Wurm70%
$0.11↓#18817↓0.44↑17.3 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."
Franklin Richards, Ascendant70%
$0.28↓#15365↓0.000.2 years↓
"At the beginning of combat on your turn, if you've cast a noncreature spell this turn, discover 6."