Purple Worm {5}{G}{G}
Creature — Worm
This spell costs {2} less to cast if a creature died this turn.
Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
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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.
Grim Reaper's Sprint 96%
$1.59#4498
"This spell costs {3} less to cast if a creature died this turn."
Macabre Reconstruction 85%
$0.10#14990
"This spell costs {2} less to cast if a creature card was put into your graveyard from anywhere this turn."
Death-Rattle Oni 83%
$0.16#17187
"This spell costs {2} less to cast for each creature that died this turn."
Blood for the Blood God! 81%
$9.67#3273
"This spell costs {1} less to cast for each creature that died this turn."
Diregraf Rebirth 81%
$0.21#12518
"This spell costs {1} less to cast for each creature that died this turn."
Conduit of Ruin 80%
$4.31#2335
"The first creature spell you cast each turn costs {2} less to cast."
Shadow in the Warp 80%
$19.36#3344
"The first creature spell you cast each turn costs {2} less to cast."