Disaster Radius {5}{R}{R}
Sorcery
As an additional cost to cast this spell, reveal a creature card from your hand.
Disaster Radius deals X damage to each creature your opponents control, where X is the revealed card's mana value.
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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.
Living Destiny 100%
$0.07#30503
"As an additional cost to cast this spell, reveal a creature card from your hand."
Charge of the Forever-Beast 100%
$0.11#25310
"As an additional cost to cast this spell, reveal a creature card from your hand."
Induce Despair 100%
$0.10#27835
"As an additional cost to cast this spell, reveal a creature card from your hand."
Titan's Presence 88%
$0.48#3517
"As an additional cost to cast this spell, reveal a colorless creature card from your hand."
Calamity of the Titans 88%
$3.98#4496
"As an additional cost to cast this spell, reveal a colorless creature card from your hand."
Scouring Sands 81%
$0.16#8216
"this card deals 1 damage to each creature your opponents control. Scry 1."
Monstrous Emergence 81%
$0.21#10689
"As an additional cost to cast this spell, choose a creature you control or reveal a creature card from your hand."