Icefall Regent 
Creature — Dragon
$0.47 #12998 0.65 11.4 years
Flying
When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature.
Spells your opponents cast that target this creature cost 
more to cast.
more to cast.Click a line or tag to filter
Cards similar to Icefall Regent 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.
Boreal Elemental96%
$0.18↓#28962↓0.27↓7.2 years↓
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Sphinx of New Prahv96%
$0.09↓#25291↓0.10↓7.6 years↓
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Dungeon Geists95%
$0.12↓#18025↓0.21↓14.6 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature."
Ty Lee, Chi Blocker88%
$0.47#6825↑0.00↓0.8 years↓
"When this card enters, tap up to one target creature. It doesn't untap during its controller's untap step for as long as you control this card."
Syr Elenora, the Discerning86%
$0.11↓#141250.00↓6.9 years↓
"Spells your opponents cast that target this card cost more to cast."
more to cast."
Elderwood Scion86%
$0.24↓#23415↓0.42↓14.3 years↑
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Sand Squid86%
$0.57↑#25810↓0.41↓26.9 years↑
"
: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped."
: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped."
Charix, the Raging Isle84%
$0.44↓#3656↑0.24↓5.9 years↓
"Spells your opponents cast that target this card cost more to cast."
more to cast."
Pursued Whale84%
$0.22↓#16408↓0.38↓6.2 years↓
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Jubilant Skybonder84%
$0.16↓#6099↑0.13↓6.4 years↓
"Creatures you control with flying have "Spells your opponents cast that target this creature cost more to cast.""
more to cast.""
Esior, Wardwing Familiar82%
$0.64↑#3368↑0.35↓5.8 years↓
"Spells your opponents cast that target one or more commanders you control cost more to cast."
more to cast."
Deserter's Quarters82%
$0.14↓#29480↓0.14↓12.3 years
"
, : Tap target creature. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."
, : Tap target creature. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."
Niblis of the Mist80%
$0.18↓#28236↓0.33↓14.6 years↑
"When this creature enters, you may tap target creature."
Starlight Snare80%
$0.13↓#20413↓0.25↓1.8 years↓
"When this Aura enters, tap enchanted creature."
Charmed Sleep80%
$0.07↓#155620.25↓6.9 years↓
"When this Aura enters, tap enchanted creature."
Claustrophobia80%
$0.05↓#19077↓0.36↓14.9 years↑
"When this Aura enters, tap enchanted creature."
Sleep Paralysis80%
$0.06↓#23005↓0.88↑10.4 years↓
"When this Aura enters, tap enchanted creature."
Paralyze80%
$0.13↓#20525↓0.5733.1 years↑
"When this Aura enters, tap enchanted creature."
Capture Sphere80%
$0.05↓#18702↓0.25↓7.9 years↓
"When this Aura enters, tap enchanted creature."
Waterknot80%
$0.12↓#21884↓0.25↓8.6 years↓
"When this Aura enters, tap enchanted creature."