Collective Nightmare 
Instant
$0.07 #23489 0.00 3.4 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.)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%
$0.14↑#230210.38↑7.2 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%
$0.05↓#227800.22↑12.1 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%
$0.30↑#4967↑0.093.4 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 Out95%
$0.13↑#18374↑0.19↑1.1 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 Golem94%
$0.07#260500.27↑12.1 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 Hopper94%
$0.25↑#17552↑0.003.4 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."
Appeal to Eirdu92%
$0.09↑#231810.000.6 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↑#14583↑0.33↑12.1 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#261000.0712.1 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 Mind91%
$0.21↑#28548↓0.67↑12.1 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 Scheme90%
$0.25↑#1295↑0.23↑4.4 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."
Burning Sun's Fury90%
$0.20↑#204940.063.4 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."
Crowd's Favor90%
$0.20↑#17530↑0.75↑12.1 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."
Stab90%
$0.17↑#10887↑0.18↑1.8 years↓
"Target creature gets -2/-2 until end of turn."
Disfigure90%
$0.05↓#16184↑0.21↑16.9 years↑
"Target creature gets -2/-2 until end of turn."
Bloodline Bidding89%
$2.27↑#2711↑0.000.6 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."
Arboretum Elemental89%
$0.10↑#226750.22↑7.9 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."
Siege Wurm89%
$0.05↓#192740.18↑20.9 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."
Ephemeral Shields89%
$0.20↑#11362↑0.0612.1 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."
Sun-Dappled Celebrant89%
$0.16↑#216270.000.6 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."