Ancient Brass Dragon 
Creature — Elder Dragon
$42.24 #1723 0.82 4.2 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%
$17.24↓#2606↓0.60↓4.2 years
"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."
+1 more matching line
Red Dragon82%
$0.25↓#6514↓0.14↓5.1 years
"Flying"
Teneb, the Harvester79%
$0.60↓#8312↓0.10↓19.6 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."
Nalfeshnee74%
$7.73↓#2677↓0.48↓4.2 years
"Flying"
The Rise of Sozin // Fire Lord Sozin72%
$1.71↓#6708↓0.00↓0.8 years↓
"Whenever Fire Lord Sozin 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."
Vesperlark72%
$0.28↓#16547↓0.07↓7.2 years↑
"Flying"
Ancient Gold Dragon72%
$31.22↓#2119↓0.71↓4.2 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."
+1 more matching line
The Falcon, Airship Restored70%
$0.25↓#8886↓0.22↓1.2 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%
$0.69↓#12769↓0.33↓28.9 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."
Debtors' Knell70%
$0.53↓#7761↓0.33↓20.6 years↑
"At the beginning of your upkeep, put target creature card from a graveyard onto the battlefield under your control."