Osseous Exhale 
Instant
$0.18 #17139 0.14 1.5 years
As an additional cost to cast this spell, you may behold a Dragon. (You may choose a Dragon you control or reveal a Dragon card from your hand.)
Osseous Exhale deals 5 damage to target attacking or blocking creature. If a Dragon was beheld, you gain 2 life.
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Cards similar to Osseous Exhale 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.
Joust Through88%
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"this card deals 3 damage to target attacking or blocking creature. You gain 1 life."
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"this card deals 4 damage to target attacking or blocking creature. You gain life equal to the excess damage dealt this way."
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"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Caustic Exhale84%
$0.12↓#166880.27↑1.5 years
"As an additional cost to cast this spell, behold a Dragon or pay ."
."
Piercing Exhale83%
$0.25↑#139940.121.5 years
"As an additional cost to cast this spell, you may behold a Dragon."
+1 more matching line
Knockout Blow83%
$0.26↑#27547↓0.39↑4.5 years↑
"this card deals 4 damage to target attacking or blocking creature and you gain 2 life."
Dispelling Exhale82%
$0.18#8878↑0.00↓1.5 years
"As an additional cost to cast this spell, you may behold a Dragon."
Molten Exhale82%
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"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
Dragon's Fire82%
$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
Foul-Tongue Invocation80%
$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
Sonar Strike80%
$0.16↓#145410.00↓2.2 years
"this card deals 4 damage to target attacking, blocking, or tapped creature. You gain 3 life if you control a Bat."
Scaleguard Sentinels78%
$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."
Sandblast78%
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"this card deals 5 damage to target attacking or blocking creature."
Dragon's Presence78%
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"this card deals 5 damage to target attacking or blocking creature."
Impeccable Timing78%
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"this card deals 3 damage to target attacking or blocking creature."
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"this card deals 4 damage to target attacking or blocking creature."
Wanderer's Intervention78%
$0.17↓#192360.00↓4.7 years↑
"this card deals 4 damage to target attacking or blocking creature."
Gideon's Reproach78%
$0.04↓#22074↓0.1011.0 years↑
"this card deals 4 damage to target attacking or blocking creature."