Undercity Plague 
Sorcery
$0.19 #20564 0.72 13.6 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%
$0.06↓#228930.8013.6 years
"Cipher"
+1 more matching line
Shadow Slice92%
$0.04↓#225760.48↓13.6 years
"Cipher"
+1 more matching line
Call of the Nightwing88%
$0.13↓#171690.18↓13.6 years
"Cipher"
Writ of Return87%
$0.39↑#11408↑0.11↓4.4 years↓
"Cipher"
Paranoid Delusions87%
$0.14↓#16422↑0.59↓13.6 years
"Cipher"
Hands of Binding86%
$0.19#15580↑0.33↓13.6 years
"Cipher"
Midnight Recovery84%
$0.13↓#190710.31↓13.6 years
"Cipher"
Whispering Madness84%
$2.57↑#3160↑0.57↓13.6 years
"Cipher"
Last Thoughts84%
$0.18↓#171910.06↓13.6 years
"Cipher"
Trait Doctoring83%
$0.34↑#13440↑0.36↓13.3 years
"Cipher"
Voidwalk82%
$0.22↑#13753↑0.20↓13.6 years
"Cipher"
Stolen Identity82%
$0.33↑#4749↑0.11↓13.6 years
"Cipher"
Arcane Heist81%
$2.94↑#5097↑0.36↓2.4 years↓
"Cipher"
Hidden Strings80%
$0.29↑#4193↑0.33↓13.3 years
"Cipher"
Forbidden Ritual78%
$1.10↑#25087↓0.40↓29.6 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%
$0.14↓#29428↓0.40↓23.3 years↑
"Target player sacrifices a permanent of their choice."
Recoil75%
$0.14↓#168880.07↓25.9 years↑
"Return target permanent to its owner's hand. Then that player discards a card."
Choice of Damnations73%
$21.55↑#12357↑0.7221.3 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%
$0.10↓#27044↓0.27↓14.3 years
"Target player discards two cards and loses 2 life."
Davriel's Shadowfugue72%
$0.10↓#238440.747.3 years↓
"Target player discards two cards and loses 2 life."