Acceptable Losses 

Sorcery
As an additional cost to cast this spell, discard a card at random.
Acceptable Losses deals 5 damage to target creature.
click a line to search just that ability, click more to combine them
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.
Sonic Seizure 100%
$0.19#29586
"As an additional cost to cast this spell, discard a card at random."
Lesser Masticore 93%
$0.38#7514
"As an additional cost to cast this spell, discard a card."
+1 more matching line