Draconic Roar 
Instant
$0.12 #19729 0.17 11.6 years
As an additional cost to cast this spell, you may reveal a Dragon card from your hand.
Draconic Roar deals 3 damage to target creature. If you revealed a Dragon card or controlled a Dragon as you cast this spell, Draconic Roar deals 3 damage to that creature's controller.
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Cards similar to Draconic Roar 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.
Scaleguard Sentinels97%
$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."
+1 more matching line
Foul-Tongue Invocation96%
$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
Orator of Ojutai96%
$0.13↑#14587↑0.06↓11.8 years
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Dragon's Fire96%
$0.27↑#7178↑0.145.2 years↓
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand or choose a Dragon you control."
+1 more matching line
Dragonlord's Prerogative95%
$0.24↑#201330.07↓11.6 years
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Silumgar's Scorn94%
$0.27↑#13403↑0.2611.6 years
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Osseous Exhale86%
$0.18↑#171390.141.5 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
+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
Sarkhan's Rage84%
$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."
Temple of the Dragon Queen80%
$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."
Caustic Exhale80%
$0.12#166880.27↑1.5 years↓
"As an additional cost to cast this spell, behold a Dragon or pay ."
."
Dragon's Disciple80%
$0.27↑#194940.31↑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."
Piercing Exhale79%
$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 Exhale78%
$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
Dracogenesis77%
$11.88↑#2217↑1.09↑1.5 years↓
"You may cast Dragon spells without paying their mana costs."
First Volley77%
$0.13↑#24577↓0.00↓21.7 years↑
"this card deals 1 damage to target creature and 1 damage to that creature's controller."
Draconic Lore76%
$0.20↑#7945↑0.244.4 years↓
"This spell costs 
less to cast if you control a Dragon."
less to cast if you control a Dragon."
Repulsor Blast74%
$0.14↑#196480.190.3 years↓
"this card deals 5 damage to target creature. If this spell was cast using teamwork, it also deals 2 damage to that creature's controller."
Dragonspeaker Shaman74%
$0.36↑#1313↑0.29↑23.4 years↑
"Dragon spells you cast cost less to cast."
less to cast."
Dragonlord's Servant74%
$0.19↑#1346↑0.2111.6 years
"Dragon spells you cast cost less to cast."
less to cast."