Sphinx Ambassador 
Creature — Sphinx
$50.51 #9966 0.65 17.3 years
Flying
Whenever this creature deals combat damage to a player, search that player's library for a card, then that player chooses a card name. If you searched for a creature card that doesn't have that name, you may put it onto the battlefield under your control. Then that player shuffles.
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Cards similar to Sphinx Ambassador 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.
Bribery86%
$3.91↓#3031↑1.32↑27.0 years↑
"Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles."
Keiga, the Tide Star78%
$0.36↓#4440↑0.6122.1 years↑
"Flying"
Inevitable Betrayal78%
$0.93↓#3120↑0.695.5 years↓
"Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles."
Bog Glider71%
$0.09↓#29605↓0.00↓26.4 years↑
"Flying"
Starfield Shepherd70%
$0.33↓#4172↑0.04↓1.2 years↓
"Flying"
Soul Seizer // Ghastly Haunting70%
$0.13↓#24420↓0.22↓14.7 years↓
"When this creature deals combat damage to a player, you may transform it. If you do, attach it to target creature that player controls."