Osseous Exhale 
Instant
$0.18 #17107 0.09 1.4 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 Through90%
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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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"this card deals 4 damage to target attacking or blocking creature and you gain 2 life."
Dispelling Exhale83%
$0.19↑#8963↑0.121.4 years
"As an additional cost to cast this spell, you may behold a Dragon."
Caustic Exhale83%
$0.11↓#166340.20↑1.4 years
"As an additional cost to cast this spell, behold a Dragon or pay ."
."
Molten Exhale82%
$0.17↓#13484↑0.101.4 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
Sonar Strike82%
$0.16↓#140210.24↑2.1 years
"this card deals 4 damage to target attacking, blocking, or tapped creature. You gain 3 life if you control a Bat."
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"As an additional cost to cast this spell, you may behold a Dragon."
+1 more matching line
Sandblast81%
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"this card deals 5 damage to target attacking or blocking creature."
Dragon's Presence81%
$0.10↓#27164↓0.25↑8.2 years↑
"this card deals 5 damage to target attacking or blocking creature."
Impeccable Timing81%
$0.04↓#24468↓0.079.9 years↑
"this card deals 3 damage to target attacking or blocking creature."
Divine Arrow81%
$0.06↓#199650.007.3 years↑
"this card deals 4 damage to target attacking or blocking creature."
Gideon's Reproach81%
$0.03↓#21862↓0.39↑10.9 years↑
"this card deals 4 damage to target attacking or blocking creature."
Wanderer's Intervention81%
$0.20↑#188280.24↑4.5 years↑
"this card deals 4 damage to target attacking or blocking creature."
Hamato Ninpō81%
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"this card deals 4 damage to target attacking or blocking creature."
Arrows of Justice81%
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"this card deals 4 damage to target attacking or blocking creature."
Cosmium Blast81%
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"this card deals 4 damage to target attacking or blocking creature."
Slash of Talons81%
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"this card deals 2 damage to target attacking or blocking creature."
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"this card deals 2 damage to target attacking or blocking creature."
Draconic Roar79%
$0.14↓#194520.1311.4 years↑
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line