Bone Devourer 
Creature — Dragon
$0.38 #10308 0.06 1.5 years
Flash
Flying
This creature enters with a number of +1/+1 counters on it equal to the number of creatures that died this turn.
When this creature dies, you draw X cards and you lose X life, where X is the number of +1/+1 counters on it.
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Cards similar to Bone Devourer 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.
Bloodcrazed Paladin92%
$0.33↓#14258↓0.139.1 years↑
"This creature enters with a +1/+1 counter on it for each creature that died this turn."
+1 more matching line
Sautekh Immortal87%
$0.37↓#16582↓0.004.0 years↑
"This creature enters with a +1/+1 counter on it for each creature that died this turn."
Khabál Ghoul86%
$136.16↑#27507↓0.24↑32.8 years↑
"At the beginning of each end step, put a +1/+1 counter on this creature for each creature that died this turn."
Novice Occultist85%
$0.24↓#122870.005.1 years↑
"When this creature dies, you draw a card and you lose 1 life."
Marketback Walker84%
$0.38#3959↑0.23↑1.7 years
"When this creature dies, draw a card for each +1/+1 counter on it."
+1 more matching line
Gravetiller Wurm84%
$0.23↓#22587↓0.0014.7 years↑
"This creature enters with four +1/+1 counters on it if a creature died this turn."
Cackling Slasher84%
$0.09↓#20209↓0.062.1 years
"This creature enters with a +1/+1 counter on it if a creature died this turn."
Somberwald Spider84%
$0.09↓#25834↓0.0615.1 years↑
"This creature enters with two +1/+1 counters on it if a creature died this turn."
Festerhide Boar84%
$0.04↓#25689↓0.0015.1 years↑
"This creature enters with two +1/+1 counters on it if a creature died this turn."
Liliana's Standard Bearer84%
$0.23↓#5976↑0.056.3 years↑
"When this creature enters, draw X cards, where X is the number of creatures that died under your control this turn."
+1 more matching line
Grizzly Ghoul83%
$0.20↓#24293↓0.005.1 years↑
"This creature enters with a +1/+1 counter on it for each creature that died this turn."
Corpse Augur83%
$0.12↓#6069↑0.18↑10.9 years↑
"When this creature dies, you draw X cards and you lose X life, where X is the number of creature cards in target player's graveyard."
Agent Venom83%
$0.38#5952↑0.061.1 years
"Flash"
Grim Wanderer83%
$0.19↓#18591↓0.005.2 years↑
"Flash"
Gorma, the Gullet82%
$0.58↑#7303↑0.27↑0.5 years↓
"Nontoken creatures you control enter with an additional +1/+1 counter on them for each creature that died under your control this turn."
Asmira, Holy Avenger82%
$1.21↑#24744↓0.1330.0 years↑
"At the beginning of each end step, put a +1/+1 counter on this card for each creature put into your graveyard from the battlefield this turn."
+1 more matching line
Gadrak, the Crown-Scourge82%
$0.35↓#3886↑0.126.3 years↑
"Flying"
Promising Duskmage80%
$0.03↓#28495↓0.005.5 years↑
"When this creature dies, if it had a +1/+1 counter on it, draw a card."
Arcbound Stinger80%
$0.21↓#83380.0022.7 years↑
"Flying"
Vogar, Necropolis Tyrant80%
$12.57↑#13752↓0.20↑4.0 years↑
"When this card dies, draw a card for each +1/+1 counter on it."
+1 more matching line