The Seventh Doctor {3}{W}{U}
Legendary Creature — Time Lord Doctor
Whenever The Seventh Doctor 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. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: 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.
Astonishing Spider-Man 86%
$2.79#21896
"Whenever this card attacks, you may discard your hand. If you do, draw a card for each card you've discarded this turn."
Amber Gristle O'Maul 85%
$0.10#15776
"Whenever this card attacks, you may discard your hand. If you do, draw a card for each player being attacked."
Anrakyr the Traveller 85%
$2.60#6630
"Whenever this card attacks, you may cast an artifact spell from your hand or graveyard by paying life equal to its mana value rather than paying its mana cost."
Rhino, Barreling Brute 84%
$0.19#13674
"Whenever this card attacks, if you've cast a spell with mana value 4 or greater this turn, draw a card."
Katara, Waterbending Master 84%
$7.61#6627
"Whenever this card attacks, you may draw a card for each experience counter you have. If you do, discard a card."
Balamb Garden, SeeD Academy // Balamb Garden, Airborne 83%
$0.32#6552
"Whenever this card attacks, draw a card."
Iron Man, Modern Marvel 83%
$43.14#19470
"Whenever this card attacks, if you control another artifact creature, draw a card."
Adrestia 83%
$0.28#8037
"Whenever this card attacks, if an Assassin crewed it this turn, draw a card. this card becomes an Assassin in addition to its other types until end of turn."
Ma Chao, Western Warrior 82%
$80.20#26861
"Whenever this card attacks alone, it can't be blocked this combat."
Sapling of Colfenor 82%
$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."
Smellerbee, Rebel Fighter 82%
$0.33#9143
"Whenever this card attacks, you may discard your hand. If you do, draw cards equal to the number of attacking creatures."
Veronica, Dissident Scribe 81%
$0.34#8598
"Whenever this card attacks, you may discard a card. If you do, draw a card."
Hans Eriksson 80%
$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."
Gwenom, Remorseless 80%
$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."
Yennett, Cryptic Sovereign 80%
$0.35#10884
"Whenever this card 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."