Mana Maze {1}{U}
Enchantment
Players can't cast spells that share a color with the spell most recently cast this turn.
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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.
City of Solitude 84%
$24.45#12894
"Players can cast spells and activate abilities only during their own turns."
Cornered Market 84%
$0.59#26633
"Players can't cast spells with the same name as a nontoken permanent."
Zenith Chronicler 84%
$0.52#2722
"Whenever a player casts their first multicolored spell each turn, each other player draws a card."
Weftwalking 83%
$0.35#14864
"The first spell each player casts during each of their turns may be cast without paying its mana cost."
Deafening Silence 83%
$2.03#1946
"Each player can't cast more than one noncreature spell each turn."
Ian Malcolm, Chaotician 82%
$6.55#11008
"During each player's turn, that player may cast a spell from among the cards they don't own exiled with this card, and mana of any type can be spent to cast it."
Spellweaver Helix 81%
$2.16#10908
"Whenever a player casts a card, if it has the same name as one of the cards exiled with this artifact, you may copy the other. If you do, you may cast the copy without paying its mana cost."
Once Upon a Time 81%
$1.45#8818
"If this spell is the first spell you've cast this game, you may cast it without paying its mana cost."
Phyrexian Censor 80%
$0.33#4365
"Each player can't cast more than one non-Phyrexian spell each turn."
Seal of the Guildpact 80%
$0.46#12196
"Each spell you cast costs {1} less to cast for each of the chosen colors it is."