Grey Host Reinforcements 

Creature — Spirit Soldier
$0.31 #12057 0.73 3.2 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.
Malanthrope93%
$0.38↑#118120.29↓3.9 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%
$0.27↓#4292↑0.18↓12.8 years↑
"When this creature enters, exile target player's graveyard."
Aegis Sculptor82%
$0.09↓#21960↓0.15↓1.4 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