Shadow in the Warp {1}{R}{G}
Enchantment
The first creature spell you cast each turn costs {2} less to cast.
Whenever an opponent casts their first noncreature spell each turn, this enchantment deals 2 damage to that player.
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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.
Conduit of Ruin 100%
$4.31#2335
"The first creature spell you cast each turn costs {2} less to cast."
Cindervines 95%
$0.35#6153
"Whenever an opponent casts a noncreature spell, this enchantment deals 1 damage to that player."
Serah Farron // Crystallized Serah 87%
$0.48#5828
"The first legendary creature spell you cast each turn costs {2} less to cast."
Macabre Reconstruction 84%
$0.10#14990
"This spell costs {2} less to cast if a creature card was put into your graveyard from anywhere this turn."
Spellshock 82%
#5455
"Whenever a player casts a spell, this enchantment deals 2 damage to that player."
Duskwatch Recruiter // Krallenhorde Howler 82%
$0.28#5979
"Creature spells you cast cost {1} less to cast."
Aether Sting 81%
$0.40#14523
"Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player."