Master of Predicaments 
Creature — Sphinx
$0.37 #11483 0.31 12.1 years
Flying
Whenever this creature deals combat damage to a player, choose a card in your hand. That player guesses whether the card's mana value is greater than 4. If the player guessed wrong, you may cast the card without paying its mana cost.
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Cards similar to Master of Predicaments 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 Archangel84%
$0.89↑#6522↑0.42↑17.6 years↑
"Whenever this creature deals combat damage to a player, you may cast a spell from your hand without paying its mana cost."
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$0.12↓#18716↓0.00↓17.1 years↑
"Flying"
Geode Golem76%
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"Whenever this creature deals combat damage to a player, you may cast your commander from the command zone without paying its mana cost."
The Seventh Doctor73%
$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."
Soul Seizer // Ghastly Haunting72%
$0.12↓#24083↓0.00↓14.6 years↑
"Flying"
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$0.23↓#21417↓0.20↓17.3 years↑
"Flying"
Smuggler's Buggy70%
$1.42↑#102340.56↑4.4 years↓
"Whenever this Vehicle deals combat damage to a player, you may cast the exiled card without paying its mana cost. If you do, return this Vehicle to its owner's hand."
Eye Collector70%
$0.16↓#103240.06↓6.9 years↓
"Flying"
Thrummingbird70%
$0.25↓#845↑0.2215.9 years↑
"Flying"