The Ur-Dragon 
Legendary Creature — Dragon Avatar
$35.73 #2622 1.97 9.0 years
Eminence — As long as The Ur-Dragon is in the command zone or on the battlefield, other Dragon spells you cast cost 
less to cast.
less to cast.Flying
Whenever one or more Dragons you control attack, draw that many cards, then you may put a permanent card from your hand onto the battlefield.
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Cards similar to The Ur-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.
Dragonlord's Servant84%
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"Dragon spells you cast cost less to cast."
less to cast."
Dragonspeaker Shaman84%
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"Dragon spells you cast cost 
less to cast."
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Acolyte of Bahamut78%
$0.24↓#9172↓0.22↓4.2 years↓
"Commander creatures you own have "The first Dragon spell you cast each turn costs less to cast.""
less to cast.""
Nogi, Draco-Zealot77%
$0.61↓#4767↓0.43↓3.9 years↓
"Dragon spells you cast cost less to cast."
less to cast."+1 more matching line
Herald of War77%
$2.53↓#3161↓0.30↓14.3 years↑
"Flying"
Sarkhan, Soul Aflame76%
$0.75↓#2062↑0.27↓3.3 years↓
"Dragon spells you cast cost less to cast."
less to cast."+1 more matching line
Messenger Falcons76%
$0.18↓#28353↓0.24↓17.3 years↑
"Flying"
Broodcaller Scourge76%
$0.47↓#3894↓0.51↓1.4 years↓
"Whenever one or more Dragons you control deal combat damage to a player, you may put a permanent card with mana value less than or equal to that damage from your hand onto the battlefield."
Ancestor Dragon74%
$0.27↓#14025↓0.56↓8.2 years
"Flying"
Draconic Lore74%
$0.19↓#7822↓0.03↓4.2 years↓
"This spell costs less to cast if you control a Dragon."
less to cast if you control a Dragon."
Kilnmouth Dragon74%
$0.73↓#17391↓0.27↓23.6 years↑
"Flying"
H.E.R.B.I.E. Scout Unit73%
$0.23↓#11423↓0.00↓0.2 years↓
"Flying"
Whirlwing Stormbrood // Dynamic Soar72%
$0.16↓#6616↓0.09↓1.4 years↓
"Flying"
Welcoming Vampire72%
$1.94↓#424↑0.22↓4.8 years↓
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Skyline Despot72%
$0.59↓#3700↓0.21↓10.0 years
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Dromoka, the Eternal70%
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"Whenever a Dragon you control attacks, bolster 2."
Shadewing Laureate70%
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"Flying"
Voracious Tome-Skimmer70%
$0.30↓#7588↓0.00↓0.6 years↓
"Flying"