Shadow Slice 
Sorcery
$0.04 #22576 0.48 13.6 years
Target opponent loses 3 life.
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 Shadow Slice 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.
Call of the Nightwing98%
$0.13↑#17169↑0.18↓13.6 years
"Cipher"
Writ of Return98%
$0.39↑#11408↑0.11↓4.4 years↓
"Cipher"
Paranoid Delusions97%
$0.14↑#16422↑0.59↑13.6 years
"Cipher"
Hands of Binding96%
$0.19↑#15580↑0.33↓13.6 years
"Cipher"
Midnight Recovery96%
$0.13↑#190710.31↓13.6 years
"Cipher"
Last Thoughts94%
$0.18↑#17191↑0.06↓13.6 years
"Cipher"
Mental Vapors94%
$0.06↑#228930.80↑13.6 years
"Cipher"
Trait Doctoring94%
$0.34↑#13440↑0.36↓13.3 years
"Cipher"
Voidwalk94%
$0.22↑#13753↑0.20↓13.6 years
"Cipher"
Stolen Identity92%
$0.33↑#4749↑0.11↓13.6 years
"Cipher"
Undercity Plague92%
$0.19↑#205640.72↑13.6 years
"Cipher"
+1 more matching line
Arcane Heist90%
$2.94↑#5097↑0.36↓2.4 years↓
"Cipher"
Whispering Madness90%
$2.57↑#3160↑0.5713.6 years
"Cipher"
Hidden Strings88%
$0.29↑#4193↑0.33↓13.3 years
"Cipher"
Bump in the Night82%
$0.21↑#255440.5314.9 years↑
"Target opponent loses 3 life."
Tendrils of Agony76%
$0.22↑#5584↑0.5023.3 years↑
"Target player loses 2 life and you gain 2 life."
Pierce Strider75%
$0.06↑#230830.15↓15.6 years↑
"When this creature enters, target opponent loses 3 life."
Fruit of Tizerus74%
$0.19↑#265980.16↓6.6 years↓
"Target player loses 2 life."
Onyx Goblet74%
$0.12↑#250240.5317.9 years↑
"
: Target player loses 1 life."
: Target player loses 1 life."
Cackling Imp72%
$0.10↑#28291↓0.22↓22.3 years↑
": Target player loses 1 life."
: Target player loses 1 life."