Viper's Kiss 
Enchantment — Aura
$0.07 #18464 0.10 12.9 years
Enchant creature
Enchanted creature gets -1/-1, and its activated abilities can't be activated.
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Cards similar to Viper's Kiss 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.
Lawmage's Binding85%
$0.19↑#162920.31↑7.6 years↓
"Enchant creature"
Exotic Curse84%
$0.12↑#28755↓0.28↑25.9 years↑
"Enchanted creature gets -1/-1 for each basic land type among lands you control."
Stupefying Touch84%
$0.13↑#24568↓0.20↑24.6 years↑
"Enchanted creature's activated abilities can't be activated."
One Thousand Lashes82%
$0.10↑#202590.57↑13.6 years
"Enchant creature"
Ironclaw Curse81%
$0.26↑#31183↓0.45↑30.9 years↑
"Enchanted creature gets -0/-1."
+1 more matching line
Prison Term81%
$0.21↑#13184↑0.1118.3 years↑
"Enchant creature"
Death's Approach80%
$0.09↑#211000.38↑13.6 years
"Enchanted creature gets -X/-X, where X is the number of creature cards in its controller's graveyard."
+1 more matching line
Krasis Incubation80%
$0.06↓#26085↓0.22↑13.3 years
"Enchant creature"
Weakness78%
$0.05↓#27665↓0.00↓33.1 years↑
"Enchanted creature gets -2/-1."
+1 more matching line
Feebleness78%
$0.10↑#28220↓0.63↑19.9 years↑
"Enchanted creature gets -2/-1."
+1 more matching line
Dead Weight78%
$0.05↓#14308↑0.43↑14.9 years↑
"Enchanted creature gets -2/-2."
+1 more matching line
Debilitating Injury78%
$0.04↓#26646↓0.27↑11.9 years
"Enchanted creature gets -2/-2."
+1 more matching line
Weight of the Underworld78%
$0.03↓#27625↓0.40↑12.6 years
"Enchanted creature gets -3/-2."
Clinging Darkness78%
$0.14↑#28078↓0.1320.9 years↑
"Enchanted creature gets -4/-1."
Mire's Grasp78%
$0.14↑#209540.00↓6.6 years↓
"Enchanted creature gets -3/-3."
+1 more matching line
Crippling Blight78%
$0.09↑#195300.50↑14.1 years↑
"Enchanted creature gets -1/-1 and can't block."
Failed Conversion78%
$0.07#25834↓0.063.4 years↓
"Enchanted creature gets -4/-4."
Stab Wound77%
$0.10↑#8978↑0.27↑13.9 years
"Enchanted creature gets -2/-2."
+1 more matching line
Detainment Spell77%
$0.26↑#181280.50↑21.0 years↑
"Enchanted creature's activated abilities can't be activated."
Volrath's Curse77%
$0.19↑#25261↓0.00↓28.9 years↑
"Enchant creature"