Drakestown Forgotten {4}{B}
Creature — Zombie
This creature enters with X +1/+1 counters on it, where X is the number of creature cards in all graveyards.
{2}{B}, Remove a +1/+1 counter from this creature: Target creature gets -1/-1 until end of turn.
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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.
Festercreep 88%
$0.27#23727
"{1}{B}, Remove a +1/+1 counter from this creature: All other creatures get -1/-1 until end of turn."
+1 more matching line
Undergrowth Scavenger 86%
$0.21#18861
"This creature enters with a number of +1/+1 counters on it equal to the number of creature cards in all graveyards."
Ambitious Dragonborn 84%
$0.27#12402
"This creature enters with X +1/+1 counters on it, where X is the greatest power among creatures you control and creature cards in your graveyard."
Centaur Vinecrasher 83%
$0.17#10983
"This creature enters with a number of +1/+1 counters on it equal to the number of land cards in all graveyards."
Academy Elite 82%
$0.24#20008
"This creature enters with X +1/+1 counters on it, where X is the number of instant and sorcery cards in all graveyards."
Realm Seekers 82%
$0.35#9270
"This creature enters with X +1/+1 counters on it, where X is the total number of cards in all players' hands."