Shadow Slice 
Sorcery
$0.04 #22713 0.27 13.7 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.
Writ of Return98%
$0.38↑#11636↑0.11↓4.5 years↓
"Cipher"
Call of the Nightwing98%
$0.18↑#17416↑0.00↓13.7 years
"Cipher"
Paranoid Delusions97%
$0.16↑#16613↑0.06↓13.7 years
"Cipher"
Hands of Binding96%
$0.16↑#15734↑0.2913.7 years
"Cipher"
Midnight Recovery96%
$0.15↑#192800.06↓13.7 years
"Cipher"
Last Thoughts94%
$0.17↑#17400↑0.05↓13.7 years
"Cipher"
Mental Vapors94%
$0.09↑#231990.2613.7 years
"Cipher"
Trait Doctoring94%
$0.32↑#13480↑0.3213.5 years
"Cipher"
Voidwalk94%
$0.25↑#13976↑0.2913.7 years
"Cipher"
Stolen Identity92%
$0.32↑#4837↑0.17↓13.7 years
"Cipher"
Undercity Plague92%
$0.19↑#207370.47↑13.7 years
"Cipher"
+1 more matching line
Arcane Heist90%
$3.12↑#5106↑0.39↑2.5 years↓
"Cipher"
Whispering Madness90%
$2.44↑#3206↑0.47↑13.7 years
"Cipher"
Hidden Strings88%
$0.33↑#4120↑0.3313.5 years
"Cipher"
Bump in the Night80%
$0.20↑#256820.17↓15.1 years↑
"Target opponent loses 3 life."
Tendrils of Agony76%
$0.27↑#5628↑0.76↑23.4 years↑
"Target player loses 2 life and you gain 2 life."
Pierce Strider75%
$0.06↑#232680.00↓15.7 years↑
"When this creature enters, target opponent loses 3 life."
Onyx Goblet74%
$0.09↑#251820.00↓18.0 years↑
"
: Target player loses 1 life."
: Target player loses 1 life."
Fruit of Tizerus73%
$0.16↑#269960.06↓6.7 years↓
"Target player loses 2 life."
Cackling Imp72%
$0.09↑#28667↓0.00↓22.4 years↑
": Target player loses 1 life."
: Target player loses 1 life."