Collective Nightmare 
Instant
$0.04 #23812 0.06 3.5 years
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 
or one mana of that creature's color.)
or one mana of that creature's color.)Target creature gets -3/-3 until end of turn.
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Cards similar to Collective Nightmare 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.
Mob98%
$0.09↑#234390.29↑7.4 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Vote Out98%
$0.16↑#18419↑0.001.2 years↓
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Unmake the Graves96%
$0.06↑#230530.0612.3 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Halo Hopper95%
$0.23↑#18087↑0.003.5 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Pile On95%
$0.29↑#5134↑0.20↑3.5 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Will-Forged Golem95%
$0.05↑#263130.0012.3 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Covenant of Blood92%
$0.07↑#262900.0612.3 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Endless Obedience92%
$0.12↑#14718↑0.33↑12.3 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Appeal to Eirdu92%
$0.08↑#230850.020.7 years↓
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Stain the Mind92%
$0.22↑#28728↓0.21↑12.3 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Lethal Scheme91%
$0.20↑#1265↑0.30↑4.5 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Crowd's Favor90%
$0.20↑#17408↑0.1012.3 years↑
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Burning Sun's Fury90%
$0.18↑#208020.22↑3.5 years
"Convoke Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color."
or one mana of that creature's color."
Last Gasp90%
$0.05↑#15840↑0.0021.0 years↑
"Target creature gets -3/-3 until end of turn."
Strangling Spores90%
$0.10↑#29489↓0.008.3 years↑
"Target creature gets -3/-3 until end of turn."
Tar Snare90%
$0.03↓#29751↓0.0010.7 years↑
"Target creature gets -3/-2 until end of turn."
Fatal Fumes90%
$0.07↑#28849↓0.1213.5 years↑
"Target creature gets -4/-2 until end of turn."
Disfigure90%
$0.05↑#16432↑0.1417.0 years↑
"Target creature gets -2/-2 until end of turn."
Stab90%
$0.20↑#10974↑0.151.9 years↓
"Target creature gets -2/-2 until end of turn."
Death Wind90%
$0.07↑#17443↑0.0714.5 years↑
"Target creature gets -X/-X until end of turn."