Grey Host Reinforcements 

Creature — Spirit Soldier
$0.28 #12274 0.59 3.3 years
Flying, ward 
When this creature enters, exile target player's graveyard. Put a number of +1/+1 counters on this creature equal to the number of creature cards exiled this way.
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Cards similar to Grey Host Reinforcements 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.
Malanthrope92%
$0.42↑#121290.06↓4.0 years
"When this creature enters, exile target player's graveyard. Put a +1/+1 counter on this creature for each creature card exiled this way."
Angel of Finality82%
$0.23↓#4139↑0.09↓13.0 years↑
"When this creature enters, exile target player's graveyard."
Aegis Sculptor82%
$0.09↓#21910↓0.00↓1.5 years↓
"At the beginning of your upkeep, you may exile two cards from your graveyard. If you do, put a +1/+1 counter on this creature."
+1 more matching line