Gloom 

Enchantment
$0.41 #24955 0.98 33.1 years
White spells cost
more to cast.
Activated abilities of white enchantments cost
more to activate.
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Cards similar to Gloom 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.
Irini Sengir90%
$0.23↓#279980.47↓30.9 years↓
"Green enchantment spells and white enchantment spells cost
more to cast."
Suppression Field83%
$0.61↑#13539↑1.0520.9 years↓
"Activated abilities cost
more to activate unless they're mana abilities."
Grand Arbiter Augustin IV76%
$17.01↑#1794↑2.58↑20.3 years↓
"White spells you cast cost
less to cast."
+1 more matching line
Geist-Fueled Scarecrow74%
$0.10↓#252430.35↓10.1 years↓
"Creature spells you cast cost
more to cast."
Whack74%
$0.02↓#272760.35↓4.4 years↓
"This spell costs
less to cast if it targets a white creature."
High Seas72%
$0.21↓#247290.81↓26.9 years↓
"Red creature spells and green creature spells cost
more to cast."
Skyseer's Chariot72%
$0.18↓#17624↑0.37↓1.6 years↓
"Activated abilities of sources with the chosen name cost
more to activate."
Anointed Peacekeeper72%
$0.32↓#18756↑1.004.0 years↓
"Spells your opponents cast with the chosen name cost
more to cast."
+1 more matching line
Defense Grid71%
$6.62↑#1899↑1.27↑27.6 years↓
"Each spell costs
more to cast except during its controller's turn."