Undercity Plague 
Sorcery
$0.19 #20737 0.47 13.7 years
Target player loses 1 life, discards a card, then sacrifices a permanent of their choice.
Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)
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Cards similar to Undercity Plague 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.
Mental Vapors97%
$0.09↓#231990.26↓13.7 years
"Cipher"
+1 more matching line
Shadow Slice92%
$0.04↓#227130.27↓13.7 years
"Cipher"
+1 more matching line
Call of the Nightwing88%
$0.18↓#174160.00↓13.7 years
"Cipher"
Writ of Return87%
$0.38↑#11636↑0.11↓4.5 years↓
"Cipher"
Paranoid Delusions87%
$0.16↓#166130.06↓13.7 years
"Cipher"
Hands of Binding86%
$0.16↓#15734↑0.29↓13.7 years
"Cipher"
Midnight Recovery84%
$0.15↓#192800.06↓13.7 years
"Cipher"
Whispering Madness84%
$2.44↑#3206↑0.4713.7 years
"Cipher"
Last Thoughts84%
$0.17↓#174000.05↓13.7 years
"Cipher"
Trait Doctoring83%
$0.32↑#13480↑0.32↓13.5 years
"Cipher"
Voidwalk82%
$0.25↑#13976↑0.29↓13.7 years
"Cipher"
Stolen Identity82%
$0.32↑#4837↑0.17↓13.7 years
"Cipher"
Arcane Heist81%
$3.12↑#5106↑0.392.5 years↓
"Cipher"
Hidden Strings80%
$0.33↑#4120↑0.33↓13.5 years
"Cipher"
Forbidden Ritual78%
$1.09↑#25324↓0.75↑29.7 years↑
"Sacrifice a nontoken permanent. If you do, target opponent loses 2 life unless that player sacrifices a permanent of their choice or discards a card. You may repeat this process any number of times."
Misguided Rage78%
$0.15↓#29819↓0.06↓23.4 years↑
"Target player sacrifices a permanent of their choice."
Recoil75%
$0.09↓#171430.10↓26.0 years↑
"Return target permanent to its owner's hand. Then that player discards a card."
Choice of Damnations73%
$22.95↑#12487↑0.75↑21.4 years↑
"Target opponent chooses a number. You may have that player lose that much life. If you don't, that player sacrifices all but that many permanents of their choice."
Mental Agony72%
$0.07↓#27343↓0.5314.5 years
"Target player discards two cards and loses 2 life."
Davriel's Shadowfugue72%
$0.10↓#241600.26↓7.5 years↓
"Target player discards two cards and loses 2 life."