Gaddock Teeg {G}{W}
Legendary Creature — Kithkin Advisor
Noncreature spells with mana value 4 or greater can't be cast.
Noncreature spells with {X} in their mana costs can't be cast.
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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.
Reidane, God of the Worthy // Valkmira, Protector's Shield 86%
$0.46#6297
"Noncreature spells your opponents cast with mana value 4 or greater cost {2} more to cast."
Krosan Drover 85%
$0.24#13636
"Creature spells you cast with mana value 6 or greater cost {2} less to cast."
Thryx, the Sudden Storm 83%
$0.15#3359
"Spells you cast with mana value 5 or greater cost {1} less to cast and can't be countered."
It That Heralds the End 81%
$0.28#2298
"Colorless spells you cast with mana value 7 or greater cost {1} less to cast."