Dragon's Fire 
Instant
$0.27 #7178 0.14 5.2 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 Roar96%
$0.12↓#19729↓0.1711.6 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Scaleguard Sentinels94%
$0.10↓#29226↓0.00↓11.6 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
Foul-Tongue Invocation94%
$0.15↓#23936↓0.1011.6 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Silumgar's Scorn93%
$0.27#13403↓0.26↑11.6 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Orator of Ojutai92%
$0.13↓#14587↓0.0611.8 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Dragonlord's Prerogative90%
$0.24↓#20133↓0.0711.6 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Molten Exhale84%
$0.21↓#13402↓0.00↓1.5 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
Osseous Exhale82%
$0.18↓#17139↓0.141.5 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
+1 more matching line
Piercing Exhale82%
$0.25↓#13994↓0.121.5 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
+1 more matching line
Dispelling Exhale80%
$0.18↓#8878↓0.00↓1.5 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
+1 more matching line
Temple of the Dragon Queen77%
$0.34↑#2563↑0.105.2 years
"As this land enters, you may reveal a Dragon card from your hand. This land enters tapped unless you revealed a Dragon card this way or you control a Dragon."
Sarkhan's Rage77%
$0.05↓#25085↓0.00↓11.6 years↑
"this card deals 5 damage to any target. If you control no Dragons, this card deals 2 damage to you."
Charge of the Forever-Beast77%
$0.16↓#25808↓0.176.5 years↑
"this card deals damage to target creature or planeswalker equal to the revealed card's power."
+1 more matching line
Caustic Exhale76%
$0.12↓#16688↓0.27↑1.5 years↓
"As an additional cost to cast this spell, behold a Dragon or pay ."
."
Dragon's Disciple76%
$0.27#19494↓0.31↑5.2 years
"As this creature enters, you may reveal a Dragon card from your hand. If you do or if you control a Dragon, this creature enters with a +1/+1 counter on it."
Voltage Surge76%
$0.12↓#20083↓0.064.7 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."
Monstrous Emergence76%
$0.23↓#11553↓0.062.1 years↓
"As an additional cost to cast this spell, choose a creature you control or reveal a creature card from your hand."
+1 more matching line
Dracogenesis75%
$11.88↑#2217↑1.09↑1.5 years↓
"You may cast Dragon spells without paying their mana costs."
Draconic Lore74%
$0.20↓#79450.244.4 years
"This spell costs 
less to cast if you control a Dragon."
less to cast if you control a Dragon."
Shivan Fire74%
$0.14↓#23561↓0.078.5 years↑
"this card deals 2 damage to target creature. If this spell was kicked, it deals 4 damage instead."