Scaleguard Sentinels 
Creature — Human Soldier
$0.09 #28900 0.00 11.4 years
As an additional cost to cast this spell, you may reveal a Dragon card from your hand.
This creature enters with a +1/+1 counter on it if you revealed a Dragon card or controlled a Dragon as you cast this spell.
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Cards similar to Scaleguard Sentinels 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.
Orator of Ojutai98%
$0.16↑#14324↑0.55↑11.7 years
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
Foul-Tongue Invocation97%
$0.13↑#236360.29↑11.4 years
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
Dragonlord's Prerogative96%
$0.25↑#19835↑0.44↑11.4 years
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Draconic Roar96%
$0.14↑#19452↑0.13↑11.4 years
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
+1 more matching line
Silumgar's Scorn95%
$0.22↑#13136↑0.21↑11.4 years
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand."
Dragon's Disciple94%
$0.20↑#19261↑0.27↑5.1 years↓
"As this creature enters, you may reveal a Dragon card from your hand. If you do or if you control a Dragon, this creature enters with a +1/+1 counter on it."
+1 more matching line
Temple of the Dragon Queen88%
$0.32↑#2536↑0.075.1 years↓
"As this land enters, you may reveal a Dragon card from your hand. This land enters tapped unless you revealed a Dragon card this way or you control a Dragon."
Sarkhan, Dragon Ascendant87%
$0.35↑#7477↑0.18↑1.4 years↓
"Whenever a Dragon you control enters, put a +1/+1 counter on this card. Until end of turn, this card becomes a Dragon in addition to its other types and gains flying."
+1 more matching line
Dracogenesis81%
$12.31↑#2300↑1.01↑1.4 years↓
"You may cast Dragon spells without paying their mana costs."
Draconic Lore80%
$0.19↑#7822↑0.034.2 years↓
"This spell costs 
less to cast if you control a Dragon."
less to cast if you control a Dragon."
Dragon's Fire80%
$0.26↑#7123↑0.005.1 years↓
"As an additional cost to cast this spell, you may reveal a Dragon card from your hand or choose a Dragon you control."
Dispelling Exhale78%
$0.19↑#8963↑0.12↑1.4 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
Molten Exhale78%
$0.17↑#13484↑0.10↑1.4 years↓
"You may cast this spell as though it had flash if you behold a Dragon as an additional cost to cast it."
Kargan Dragonrider78%
$0.07↓#250550.22↑8.1 years↓
"As long as you control a Dragon, this creature has flying."
Dragonspeaker Shaman78%
$1.98↑#1312↑0.26↑23.3 years↑
"Dragon spells you cast cost less to cast."
less to cast."
Dragonlord's Servant78%
$0.28↑#1344↑0.22↑11.4 years
"Dragon spells you cast cost 
less to cast."
less to cast."
Osseous Exhale77%
$0.18↑#17107↑0.091.4 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
Caustic Exhale77%
$0.11↑#16634↑0.20↑1.4 years↓
"As an additional cost to cast this spell, behold a Dragon or pay ."
."
Piercing Exhale76%
$0.19↑#14054↑0.15↑1.4 years↓
"As an additional cost to cast this spell, you may behold a Dragon."
Acid-Spewer Dragon74%
$0.24↑#21551↑0.27↑11.4 years
"When this creature is turned face up, put a +1/+1 counter on each other Dragon creature you control."