Yennett, Cryptic Sovereign {2}{W}{U}{B}
Legendary Creature — Sphinx
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 that do something similar 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.
Sapling of Colfenor 99%
$7.08#6640
"Whenever this card attacks, reveal the top card of your library. If it's a creature card, you gain life equal to that card's toughness, lose life equal to its power, then put it into your hand."
Hans Eriksson 99%
$0.13#17784
"Whenever this card attacks, reveal the top card of your library. If it's a creature card, put it onto the battlefield tapped and attacking defending player or a planeswalker they control. Otherwise, put that card into your hand. When you put a creature card onto the battlefield this way, it fights this card."
Rulik Mons, Warren Chief 90%
$0.17#12851
"Whenever this card attacks, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. If you didn't put a card onto the battlefield this way, create a 1/1 red Goblin creature token."
Kellan, Daring Traveler // Journey On 89%
$0.26#13824
"Whenever this card attacks, reveal the top card of your library. If it's a creature card with mana value 3 or less, put it into your hand. Otherwise, you may put it into your graveyard."
Gwenom, Remorseless 88%
$4.47#3139
"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."
The Lunar Whale 85%
$0.33#11209
"As long as this card attacked this turn, you may play the top card of your library."
Daredevil, Fearless Fighter 82%
$3.56#19255
"Whenever this card attacks, exile the top card of your library. this card deals damage to you equal to that card's mana value. You may play it this turn."
Mobile Homestead 82%
$0.24#11970
"Whenever this Vehicle attacks, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped."
Raiders' Karve 82%
$0.15#9210
"Whenever this Vehicle attacks, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped."
Wickerfolk Thresher 81%
$0.23#10404
"Whenever this creature attacks, if there are four or more card types among cards in your graveyard, look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand."
Laelia, the Blade Reforged 81%
$0.30#1297
"Whenever this card attacks, exile the top card of your library. You may play that card this turn."
The Seventh Doctor 80%
$0.27#10814
"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."