Ancient Brass Dragon 
Creature — Elder Dragon
$38.93 #1760 0.75 4.4 years
Flying
Whenever this creature deals combat damage to a player, roll a d20. When you do, put any number of target creature cards with total mana value X or less from graveyards onto the battlefield under your control, where X is the result.
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Cards similar to Ancient Brass Dragon 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.
Ancient Bronze Dragon86%
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"Whenever this creature deals combat damage to a player, roll a d20. When you do, put X +1/+1 counters on each of up to two target creatures, where X is the result."
Chardalyn Dragon85%
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"Flying"
Black Dragon82%
$0.30↓#15804↓0.06↓5.2 years
"Flying"
Teneb, the Harvester79%
$0.58↓#8559↓0.25↓19.7 years↑
"Whenever this card deals combat damage to a player, you may pay 
. If you do, put target creature card from a graveyard onto the battlefield under your control."
. If you do, put target creature card from a graveyard onto the battlefield under your control."
The Rise of Sozin // Fire Lord Sozin76%
$1.86↓#6534↓0.730.9 years↓
"Whenever this card deals combat damage to a player, you may pay 
. When you do, put any number of target creature cards with total mana value X or less from that player's graveyard onto the battlefield under your control."
. When you do, put any number of target creature cards with total mana value X or less from that player's graveyard onto the battlefield under your control."
Flameskull74%
$0.29↓#22056↓0.06↓5.2 years
"Flying"
Ancient Gold Dragon72%
$28.00↓#2171↓0.764.4 years
"Whenever this creature deals combat damage to a player, roll a d20. You create a number of 1/1 blue Faerie Dragon creature tokens with flying equal to the result."
Bringer of the Last Gift72%
$0.74↓#4849↓0.29↓2.9 years↓
"Flying"
Sapphire Dragon // Psionic Pulse71%
$0.32↓#5806↓0.25↓4.4 years
"Flying"
The Falcon, Airship Restored70%
$0.23↓#8750↓0.00↓1.4 years↓
"Whenever this card deals combat damage to a player, you may sacrifice it. When you do, return target creature card from your graveyard to the battlefield."
Coffin Queen70%
$0.71↓#12791↓0.18↓29.0 years↑
", 
: Put target creature card from a graveyard onto the battlefield under your control. When this creature becomes untapped or you lose control of this creature, exile that creature."
, : Put target creature card from a graveyard onto the battlefield under your control. When this creature becomes untapped or you lose control of this creature, exile that creature."
Mistmoon Griffin70%
$0.25↓#21790↓0.11↓29.4 years↑
"Flying"
Debtors' Knell70%
$0.43↓#8039↓0.13↓20.7 years↑
"At the beginning of your upkeep, put target creature card from a graveyard onto the battlefield under your control."