Dragon's Fire 
Instant
$0.26 #7123 0.00 5.1 years
As an additional cost to cast this spell, you may reveal a Dragon card from your hand or choose a Dragon you control.
Dragon's Fire deals 3 damage to target creature or planeswalker. If you revealed a Dragon card or chose a Dragon as you cast this spell, Dragon's Fire deals damage equal to the power of that card or creature instead.
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Cards similar to Dragon's Fire 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.
Draconic Roar90%
$0.14↓#19452↓0.13↑11.4 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Molten Exhale86%
$0.17↓#13484↓0.10↑1.4 years↓
"You may cast this spell as though it had flash if you behold a Dragon as an additional cost to cast it."
+1 more matching line
Dispelling Exhale84%
$0.19↓#8963↓0.12↑1.4 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
+1 more matching line
Piercing Exhale84%
$0.19↓#14054↓0.15↑1.4 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
+1 more matching line
Silumgar's Scorn82%
$0.22↓#13136↓0.21↑11.4 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Sarkhan's Rage82%
$0.06↓#24862↓0.0611.4 years↑
"this card deals 5 damage to any target. If you control no Dragons, this card deals 2 damage to you."
Foul-Tongue Invocation81%
$0.13↓#23636↓0.29↑11.4 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Scaleguard Sentinels80%
$0.09↓#28900↓0.0011.4 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
Osseous Exhale79%
$0.18↓#17107↓0.091.4 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
+1 more matching line
Charge of the Forever-Beast79%
$0.12↓#25561↓0.29↑6.4 years↑
"this card deals damage to target creature or planeswalker equal to the revealed card's power."
+1 more matching line
Voltage Surge79%
$0.15↓#19821↓0.11↑4.5 years
"this card deals 2 damage to target creature or planeswalker. If this spell's additional cost was paid, this card deals 4 damage instead."
Orator of Ojutai78%
$0.16↓#14324↓0.55↑11.7 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
Chandra's Triumph78%
$0.14↓#17271↓0.21↑7.3 years↑
"this card deals 3 damage to target creature or planeswalker an opponent controls. this card deals 5 damage instead if you control a Chandra planeswalker."
Dracogenesis78%
$12.31↑#2300↑1.01↑1.4 years↓
"You may cast Dragon spells without paying their mana costs."
Dragonlord's Prerogative78%
$0.25↓#19835↓0.44↑11.4 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Draconic Lore78%
$0.19↓#78220.034.2 years
"This spell costs 
less to cast if you control a Dragon."
less to cast if you control a Dragon."
Shivan Fire78%
$0.13↓#23240↓0.008.4 years↑
"this card deals 2 damage to target creature. If this spell was kicked, it deals 4 damage instead."
Caustic Exhale77%
$0.11↓#16634↓0.20↑1.4 years↓
"As an additional cost to cast this spell, behold a Dragon or pay ."
."
Unholy Heat77%
$0.28↑#9059↓0.18↑5.2 years
"this card deals 2 damage to target creature or planeswalker."
Flame Discharge76%
$0.09↓#21056↓0.004.5 years
"this card deals X damage to target creature or planeswalker. If you controlled a modified creature as you cast this spell, it deals X plus 2 damage instead."