Desolation of Smaug 
Sorcery
$0.36 #10305 0.33 0.2 years
Desolation of Smaug deals 3 damage to each non-Dragon creature.
Add four mana in any combination of colors. Spend this mana only to cast Dragon spells.
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Cards similar to Desolation of Smaug 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.
Breath Weapon90%
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"this card deals 2 damage to each non-Dragon creature."
Crux of Fate80%
$0.28↓#1584↑0.63↑11.7 years↑
"• Destroy all non-Dragon creatures."
Draconic Intervention79%
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"this card deals X damage to each non-Dragon creature, where X is the exiled card's mana value. If a creature dealt damage this way would die this turn, exile it instead."
Sarkhan, Fireblood78%
$0.46↑#5801↑0.06↓8.3 years↑
"+1: Add two mana in any combination of colors. Spend this mana only to cast Dragon spells."
Scavenger Regent // Exude Toxin77%
$0.45↑#6051↑0.281.5 years↑
"Each non-Dragon creature gets -X/-X until end of turn."
Manamorphose74%
$4.40↑#2323↑0.19↓18.5 years↑
"Add two mana in any combination of colors."
Orb of Dragonkind74%
$0.37↑#3775↑0.47↑5.3 years↑
"
, 
: Add two mana in any combination of colors. Spend this mana only to cast Dragon spells or activate abilities of Dragons."
, : Add two mana in any combination of colors. Spend this mana only to cast Dragon spells or activate abilities of Dragons."
Rivaz of the Claw73%
$0.66↑#3004↑0.20↓4.1 years↑
": Add two mana in any combination of colors. Spend this mana only to cast Dragon creature spells."
: Add two mana in any combination of colors. Spend this mana only to cast Dragon creature spells."+1 more matching line
Crucible of the Spirit Dragon73%
$0.60↑#4186↑0.11↓11.7 years↑
", Remove X storage counters from this land: Add X mana in any combination of colors. Spend this mana only to cast Dragon spells or activate abilities of Dragons."
, Remove X storage counters from this land: Add X mana in any combination of colors. Spend this mana only to cast Dragon spells or activate abilities of Dragons."
Maelstrom of the Spirit Dragon72%
$1.30↑#1992↑0.14↓1.5 years↑
": Add one mana of any color. Spend this mana only to cast a Dragon spell or an Omen spell."
: Add one mana of any color. Spend this mana only to cast a Dragon spell or an Omen spell."
Sivitri, Dragon Master72%
$5.49↑#93800.294.1 years↑
"−7: Destroy all non-Dragon creatures."
Glorybringer70%
$0.30↓#7451↑0.07↓9.5 years↑
"You may exert this creature as it attacks. When you do, it deals 4 damage to target non-Dragon creature an opponent controls."
Haven of the Spirit Dragon70%
$0.31↓#1140↑0.16↓11.6 years↑
": Add one mana of any color. Spend this mana only to cast a Dragon creature spell."
: Add one mana of any color. Spend this mana only to cast a Dragon creature spell."+1 more matching line
Rosethorn Acolyte // Seasonal Ritual70%
$0.19↓#100290.00↓7.0 years↑
"Add one mana of any color."
Apex of Power70%
$0.99↑#3951↑0.318.3 years↑
"If this spell was cast from your hand, add ten mana of any one color."