Custodi Soulbinders 

Creature — Human Cleric
This creature enters with X +1/+1 counters on it, where X is the number of other creatures on the battlefield.
{2}{W}, Remove a +1/+1 counter from this creature: Create a 1/1 white Spirit creature token with flying.
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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.
Stag Beetle 100%
$0.67#20183
"This creature enters with X +1/+1 counters on it, where X is the number of other creatures on the battlefield."
Twilight Drover 100%
$0.25#6564
"{2}{W}, Remove a +1/+1 counter from this creature: Create two 1/1 white Spirit creature tokens with flying."
Ignition Team 87%
$0.35#21775
"This creature enters with X +1/+1 counters on it, where X is the number of tapped lands on the battlefield."
Shinewend 86%
$0.27#19033
"{1}{W}, Remove a +1/+1 counter from this creature: Destroy target enchantment."
+1 more matching line
Ambitious Dragonborn 85%
$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."
Towering Titan 85%
$0.32#4823
"This creature enters with X +1/+1 counters on it, where X is the total toughness of other creatures you control."
Voracious Wurm 84%
$0.12#20979
"This creature enters with X +1/+1 counters on it, where X is the amount of life you've gained this turn."
Cogwork Grinder 84%
$0.26#31616
"This creature enters with X +1/+1 counters on it, where X is the number of cards you removed from the draft with cards named this card."