Dark Impostor 

Creature — Vampire Assassin
{4}{B}{B}: Exile target creature and put a +1/+1 counter on this creature.
This creature has all activated abilities of all creature cards exiled with it.
click a line to search just that ability, click more to combine them
Cards that do something similar 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 Crawler 100%
$0.24#19778
"This creature has all activated abilities of all creature cards exiled with it."
+1 more matching line