Kozilek's Return 
Instant
$0.43 #9312 0.50 10.7 years
Devoid (This card has no color.)
Kozilek's Return deals 2 damage to each creature.
Whenever you cast an Eldrazi creature spell with mana value 7 or greater, you may exile this card from your graveyard. If you do, this card deals 5 damage to each creature.
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Cards similar to Kozilek's Return 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.
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Spawn-Gang Commander82%
$0.23↓#77870.14↓2.3 years↓
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Reality Hemorrhage80%
$0.05↓#27904↓0.00↓10.7 years
"Devoid"
Kozilek's Sentinel80%
$0.15↓#28210↓0.07↓11.0 years
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Pyroclasm80%
$0.18↓#77610.06↓31.4 years↑
"this card deals 2 damage to each creature."
Savage Twister80%
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"this card deals X damage to each creature."
Flaying Tendrils80%
$0.06↓#24823↓0.13↓10.8 years
"Devoid"
Sky Scourer80%
$0.09↓#28543↓0.00↓10.7 years
"Devoid"
Complete Disregard80%
$0.05↓#24681↓0.33↓11.0 years
"Devoid"
Oblivion Strike80%
$0.04↓#20804↓0.07↓10.7 years
"Devoid"
Molten Nursery79%
$0.15↓#23441↓0.11↓11.0 years
"Devoid"
Fanged Flames79%
$0.14↓#15607↓0.13↓2.3 years↓
"Devoid"
Blinding Drone79%
$0.09↓#23775↓0.19↓10.7 years
"Devoid"
Stalking Drone78%
$0.04↓#30041↓0.00↓10.7 years
"Devoid"
Serpentine Spike78%
$0.16↓#27649↓0.12↓11.0 years
"Devoid"
Sifter of Skulls78%
$0.82↑#3620↑0.20↓10.7 years
"Devoid"