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.
Dark Deed 99%
$0.20#21658
"Target creature gets -4/-4 until end of turn."
Lash of the Whip 99%
$0.04#28521
"Target creature gets -4/-4 until end of turn."
Flatten 99%
$0.05#27993
"Target creature gets -4/-4 until end of turn."
Sudden Death 99%
$0.12#18257
"Target creature gets -4/-4 until end of turn."
Grasp of Darkness 99%
$0.13#11113
"Target creature gets -4/-4 until end of turn."
Death Pulse 99%
$0.19#27188
"Target creature gets -4/-4 until end of turn."
Whack 99%
$0.06#26685
"Target creature gets -4/-4 until end of turn."
Throttle 99%
$0.06#28446
"Target creature gets -4/-4 until end of turn."
Code of Constraint 99%
$0.08#26344
"Target creature gets -4/-0 until end of turn."
Jace's Scrutiny 99%
$0.14#22272
"Target creature gets -4/-0 until end of turn."
Befuddle 99%
$0.07#21524
"Target creature gets -4/-0 until end of turn."
Arcane Subtraction 99%
$0.05#25624
"Target creature gets -4/-0 until end of turn."
Obyra's Attendants // Desperate Parry 99%
$0.12#18898
"Target creature gets -4/-0 until end of turn."
Depower 99%
$0.12#22822
"Target creature gets -4/-0 until end of turn."
Fatal Fumes 99%
$0.06#29266
"Target creature gets -4/-2 until end of turn."
Hydrosurge 99%
$0.05#26428
"Target creature gets -5/-0 until end of turn."
Shrink 99%
#28990
"Target creature gets -5/-0 until end of turn."
Drown in Ichor 99%
$0.65#2040
"Target creature gets -4/-4 until end of turn. Proliferate."