Exoskeletal Armor 
Enchantment — Aura
$0.31 #21758 0.32 24.4 years
Enchant creature
Enchanted creature gets +X/+X, where X is the number of creature cards in all graveyards.
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Cards similar to Exoskeletal Armor 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.
Nighthowler91%
$0.23↓#4456↑0.07↓13.1 years↓
"This creature and enchanted creature each get +X/+X, where X is the number of creature cards in all graveyards."
Wreath of Geists88%
$0.09↓#234490.07↓15.1 years↓
"Enchanted creature gets +X/+X, where X is the number of creature cards in your graveyard."
+1 more matching line
Bonehoard84%
$0.24↓#5242↑0.07↓15.7 years↓
"Equipped creature gets +X/+X, where X is the number of creature cards in all graveyards."
Lhurgoyf82%
$0.24↓#8516↑0.53↑31.4 years↑
"this card's power is equal to the number of creature cards in all graveyards and its toughness is equal to that number plus 1."
Undergrowth Scavenger82%
$0.19↓#197600.18↓12.3 years↓
"This creature enters with a number of +1/+1 counters on it equal to the number of creature cards in all graveyards."
Mortivore82%
$0.30↓#5630↑0.20↓25.1 years
"this card's power and toughness are each equal to the number of creature cards in all graveyards."
Cruel Somnophage // Can't Wake Up80%
$0.37↑#5044↑0.313.1 years↓
"this card's power and toughness are each equal to the number of creature cards in all graveyards."
Drakestown Forgotten78%
$0.33↑#239040.12↓12.4 years↓
"This creature enters with X +1/+1 counters on it, where X is the number of creature cards in all graveyards."
Liliana's Elite76%
$0.21↓#16312↑0.11↓10.2 years↓
"This creature gets +1/+1 for each creature card in your graveyard."
Wight of Precinct Six75%
$0.14↓#9497↑0.20↓13.7 years↓
"This creature gets +1/+1 for each creature card in your opponents' graveyards."
Necrogoyf75%
$0.29↓#3154↑0.54↑5.5 years↓
"this card's power is equal to the number of creature cards in all graveyards."
Moon-Vigil Adherents70%
$0.22↓#10450↑0.17↓0.7 years↓
"This creature gets +1/+1 for each creature you control and each creature card in your graveyard."
Cantivore70%
$0.63↑#29732↓0.11↓25.1 years
"this card's power and toughness are each equal to the number of enchantment cards in all graveyards."