Damping Sphere {2}
Artifact
If a land is tapped for two or more mana, it produces {C} instead of any other type and amount.
Each spell a player casts costs {1} more to cast for each other spell that player has 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.
Weftwalking 91%
$0.35#14864
"The first spell each player casts during each of their turns may be cast without paying its mana cost."
Deafening Silence 84%
$2.03#1946
"Each player can't cast more than one noncreature spell each turn."
Delightful Discovery 82%
$0.27#15894
"This spell costs {1} less to cast for each spell your opponents have cast this 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."
Tithe Taker 82%
$0.35#7544
"During your turn, spells your opponents cast cost {1} more to cast and abilities your opponents activate cost {1} more to activate unless they're mana abilities."