White Dragon 
Creature — Dragon
$0.21 #16599 0.11 5.2 years
Flying
Cold Breath — When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
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Cards similar to White 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.
Dragon Turtle99%
$0.33↑#11751↑0.36↑5.2 years
"When this creature enters, tap it and up to one target creature an opponent controls. They don't untap during their controllers' next untap steps."
Frost Lynx96%
$0.04↓#20063↓0.27↑12.3 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Frost Trickster96%
$0.10↓#178620.25↑5.5 years
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Spire Patrol96%
$0.05↓#28618↓0.049.7 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Stitched Mangler96%
$0.13↓#21336↓0.31↑10.5 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Watertrap Weaver96%
$0.08↓#22463↓0.39↑9.1 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Kor Hookmaster96%
$0.05↓#25885↓0.0617.0 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step."
Chillbringer96%
$0.06↓#26268↓0.067.7 years↑
"When this creature enters, tap target creature an opponent controls. It doesn't untap during its controller's next untap step."
Chardalyn Dragon95%
$0.24↑#21333↓0.00↓4.4 years
"Flying"
Juvenile Mist Dragon94%
$0.20↓#152950.22↑4.4 years
"When this creature enters, for each opponent, tap up to one target creature that player controls. Each of those creatures doesn't untap during its controller's next untap step."
Fractal Mascot92%
$0.09↓#22254↓0.090.5 years↓
"When this creature enters, tap target creature an opponent controls. Put a stun counter on it."
Alchemax Slayer-Bots92%
$0.19↓#180340.43↑1.1 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Shipwreck Patrol92%
$0.21#29666↓0.160.3 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Rowdy Snowballers92%
$0.10↓#138240.170.9 years↓
"When this creature enters, tap target creature an opponent controls and put a stun counter on it."
Fear of Immobility92%
$0.13↓#176540.25↑2.1 years↓
"When this creature enters, tap up to one target creature. If an opponent controls that creature, put a stun counter on it."
Utrom Scientists92%
$0.06↓#21901↓0.31↑0.6 years↓
"When this creature enters, tap up to one target creature and put a stun counter on it."
Take into Custody91%
$0.04↓#23846↓0.069.7 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Press for Answers90%
$0.06↓#20546↓0.1210.5 years↑
"Tap target creature. It doesn't untap during its controller's next untap step."
Celestial Regulator90%
$0.12↓#22266↓0.00↓4.5 years
"When this creature enters, choose target creature you don't control and tap it. If you control a creature with a counter on it, the chosen creature doesn't untap during its controller's next untap step."
Black Dragon90%
$0.30↑#158040.065.2 years
"Flying"