Necrotic Ooze 
Creature — Ooze
$2.61 #4596 0.45 16.1 years
As long as this creature is on the battlefield, it has all activated abilities of all creature cards in all graveyards.
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Cards similar to Necrotic Ooze 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.
Mirran Safehouse88%
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Trazyn the Infinite80%
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"As long as Trazyn is on the battlefield, it has all activated abilities of all artifact cards in your graveyard."
Marvin, Murderous Mimic79%
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"this card has all activated abilities of creatures you control that don't have the same name as this creature."
Manascape Refractor78%
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"This artifact has all activated abilities of all lands on the battlefield."
Koh, the Face Stealer75%
$0.39↓#9435↓0.390.9 years↓
"this card has all activated and triggered abilities of the last chosen card."
Quicksilver Elemental75%
$20.51↑#7730↓0.3723.0 years↑
"
: This creature gains all activated abilities of target creature until end of turn."
: This creature gains all activated abilities of target creature until end of turn."
Experiment Kraj74%
$0.38↓#10685↓0.3620.5 years↑
"this card has all activated abilities of each other creature with a +1/+1 counter on it."
Patchwork Crawler74%
$0.16↓#20555↓0.30↓4.9 years↓
"This creature has all activated abilities of all creature cards exiled with it."
Sharkey, Tyrant of the Shire74%
$0.23↓#20324↓0.82↑3.3 years↓
"this card has all activated abilities of lands your opponents control except mana abilities."
Dark Impostor74%
$0.33↓#11183↓0.16↓14.5 years↓
"This creature has all activated abilities of all creature cards exiled with it."
Robaran Mercenaries72%
$0.28↓#18051↓0.00↓4.1 years↓
"This creature has all activated abilities of all legendary creatures you control."
Skill Borrower70%
$0.30↓#24998↓0.22↓18.0 years↑
"As long as the top card of your library is an artifact or creature card, this creature has all activated abilities of that card."