Dark Impostor 

Creature — Vampire Assassin
$0.35 #10818 0.29 14.3 years
This creature has all activated abilities of all creature cards exiled with it.
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Cards similar to Dark Impostor 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.
Patchwork Crawler96%
$0.14↓#20190↓0.11↓4.8 years↓
"This creature has all activated abilities of all creature cards exiled with it."
+1 more matching line
Myr Welder86%
$2.78↑#7514↑0.15↓15.6 years↑
"This creature has all activated abilities of all cards exiled with it."
Territory Forge86%
$0.33↓#18146↓0.302.4 years↓
"This artifact has all activated abilities of the exiled card."
Koh, the Face Stealer84%
$0.36↑#96640.00↓0.8 years↓
"this card has all activated and triggered abilities of the last chosen card."
+1 more matching line
Experiment Kraj82%
$0.40↑#106520.88↑20.3 years↑
"
: Put a +1/+1 counter on target creature."
+1 more matching line
Shauku, Endbringer81%
$2.36↑#20908↓0.60↑29.9 years↑
"
: Exile target creature and put a +1/+1 counter on this card."
+1 more matching line
Karlov of the Ghost Council78%
$10.47↑#3905↑0.40↑10.8 years↓
"
, Remove six +1/+1 counters from Karlov: Exile target creature."
Idris, Soul of the TARDIS76%
$0.24↓#20403↓0.80↑2.9 years↓
"this card has all activated and triggered abilities of the exiled card and gets +X/+X, where X is the exiled card's mana value."
Quicksilver Elemental74%
$20.07↑#7905↑0.60↑22.9 years↑
"
: This creature gains all activated abilities of target creature until end of turn."
Hazel's Brewmaster74%
$3.96↑#2319↑0.382.1 years↓
"Foods you control have all activated abilities of all creature cards exiled with this creature."
Necrotic Ooze74%
$2.41↑#4599↑0.3715.9 years↑
"As long as this creature is on the battlefield, it has all activated abilities of all creature cards in all graveyards."
Helvault72%
$0.23↓#22011↓0.3114.6 years
"
,
: Exile target creature you don't control."
+1 more matching line
Agatha's Soul Cauldron72%
$35.79↑#1375↑1.18↑3.0 years↓
"Creatures you control with +1/+1 counters on them have all activated abilities of all creature cards exiled with this card."
Mairsil, the Pretender71%
$0.40↑#18471↓0.47↑9.0 years↓
"this card has all activated abilities of all cards you own in exile with cage counters on them. You may activate each of those abilities only once each turn."
Marvin, Murderous Mimic70%
$3.37↑#1090↑0.47↑1.9 years↓
"this card has all activated abilities of creatures you control that don't have the same name as this creature."