Call of the Nightwing 
Sorcery
$0.18 #17416 0.00 13.7 years
Create a 1/1 blue and black Horror creature token with flying.
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 Call of the Nightwing 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.
Shadow Slice98%
$0.04↓#22713↓0.27↑13.7 years
"Cipher"
Writ of Return97%
$0.38↑#11636↑0.11↑4.5 years↓
"Cipher"
Paranoid Delusions96%
$0.16↓#166130.0613.7 years
"Cipher"
Hands of Binding96%
$0.16↓#157340.29↑13.7 years
"Cipher"
Midnight Recovery96%
$0.15↓#192800.0613.7 years
"Cipher"
Last Thoughts95%
$0.17↓#174000.0513.7 years
"Cipher"
Mental Vapors93%
$0.09↓#23199↓0.26↑13.7 years
"Cipher"
Trait Doctoring92%
$0.32↑#13480↑0.32↑13.5 years
"Cipher"
Voidwalk92%
$0.25↑#139760.29↑13.7 years
"Cipher"
Whispering Madness91%
$2.44↑#3206↑0.47↑13.7 years
"Cipher"
Stolen Identity90%
$0.32↑#4837↑0.17↑13.7 years
"Cipher"
Arcane Heist89%
$3.12↑#5106↑0.39↑2.5 years↓
"Cipher"
Hidden Strings88%
$0.33↑#4120↑0.33↑13.5 years
"Cipher"
Undercity Plague88%
$0.19↑#207370.47↑13.7 years
"Cipher"
Ojutai's Summons80%
$0.04↓#27372↓0.0011.6 years↓
"Create a 2/2 blue Djinn Monk creature token with flying."
Elemental Eruption74%
$2.37↑#5633↑0.26↑2.5 years↓
"Create a 4/4 red Dragon Elemental creature token with flying and prowess."
+1 more matching line
Luminous Angel74%
$0.71↑#22849↓0.18↑23.0 years↑
"At the beginning of your upkeep, you may create a 1/1 white Spirit creature token with flying."
Entreat the Angels72%
$0.43↑#5107↑0.56↑14.5 years
"Create X 4/4 white Angel creature tokens with flying."
Pegasus Stampede72%
$0.23↑#25832↓0.18↑28.3 years↑
"Create a 1/1 white Pegasus creature token with flying."
Chatterstorm72%
$0.18#2869↑0.35↑5.3 years↓
"Create a 1/1 green Squirrel creature token."
+1 more matching line