Yennett, Cryptic Sovereign 
Legendary Creature — Sphinx
$0.37 #11069 0.27 8.1 years
Flying, vigilance, menace
Whenever Yennett attacks, reveal the top card of your library. You may cast it without paying its mana cost if its mana value is odd. If you don't cast it, draw a card.
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Cards similar to Yennett, Cryptic Sovereign 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.
Rashmi, Eternities Crafter84%
$0.39↑#3551↑0.259.9 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."
Two-Headed Hellkite78%
$9.86↑#4720↑0.14↓4.0 years↓
"Flying, menace, haste"
+1 more matching line
Powerbalance78%
$0.32↓#2443↑0.41↑2.2 years↓
"Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, you may cast that card without paying its mana cost if the two spells have the same mana value."
Rhino, Barreling Brute76%
$0.25↓#13358↓0.181.0 years↓
"Whenever this card attacks, if you've cast a spell with mana value 4 or greater this turn, draw a card."
Library Larcenist74%
$0.18↓#17118↓0.00↓6.2 years↓
"Whenever this creature attacks, draw a card."
Descendants' Path73%
$0.91↑#2182↑0.3314.3 years↑
"At the beginning of your upkeep, reveal the top card of your library. If it's a creature card that shares a creature type with a creature you control, you may cast it without paying its mana cost. If you don't cast it, put it on the bottom of your library."
Iron Man, Master of Machines72%
$0.25↓#123720.00↓0.2 years↓
"Flying, vigilance"
Yue, the Moon Spirit72%
$0.33↓#6696↑0.00↓0.8 years↓
"Flying, vigilance"
Angelic Sell-Sword72%
$0.41↑#8389↑0.11↓2.4 years↓
"Flying, vigilance"
Gwenom, Remorseless72%
$5.05↑#2886↑0.97↑1.0 years↓
"Whenever this card attacks, until end of turn, you may look at the top card of your library any time and you may play cards from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost."
Epistolary Librarian72%
$0.37#13934↓0.00↓3.9 years↓
"Whenever this creature attacks, you may cast a spell with mana value X or less from your hand without paying its mana cost, where X is the number of attacking creatures."
Yusri, Fortune's Flame71%
$0.22↓#6716↑0.39↑5.3 years↓
"Whenever this card attacks, choose a number between 1 and 5. Flip that many coins. For each flip you win, draw a card. For each flip you lose, this card deals 2 damage to you. If you won five flips this way, you may cast spells from your hand this turn without paying their mana costs."
Voracious Bibliophile70%
$0.29↓#7729↑0.291.4 years↓
"Flying, vigilance"
One with the Multiverse70%
$2.65↑#1919↑0.74↑3.8 years↓
"Once during each of your turns, you may cast a spell from your hand or the top of your library without paying its mana cost."
Mysterio's Phantasm70%
$0.18↓#17526↓0.291.0 years↓
"Flying, vigilance"
+1 more matching line
The Seventh Doctor70%
$0.31↓#110660.66↑2.9 years↓
"Whenever this card attacks, choose a card in your hand. Defending player guesses whether that card's mana value is greater than the number of artifacts you control. If they guessed wrong, you may cast it without paying its mana cost. If you don't cast a spell this way, investigate."
Cecily, Haunted Mage70%
$0.40↑#122570.73↑4.9 years↓
"Whenever this card attacks, you draw a card and you lose 1 life. Then if you have eleven or more cards in your hand, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Galvanoth70%
$0.31↓#130540.2015.6 years↑
"At the beginning of your upkeep, you may look at the top card of your library. You may cast it without paying its mana cost if it's an instant or sorcery spell."