Exoskeletal Armor 
Enchantment — Aura
$0.31 #21445 0.38 24.3 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↓#4327↑0.22↓13.0 years↓
"This creature and enchanted creature each get +X/+X, where X is the number of creature cards in all graveyards."
Wreath of Geists89%
$0.10↓#231260.55↑14.9 years↓
"Enchanted creature gets +X/+X, where X is the number of creature cards in your graveyard."
Bonehoard84%
$0.24↓#5030↑0.21↓15.6 years↓
"Equipped creature gets +X/+X, where X is the number of creature cards in all graveyards."
Lhurgoyf82%
$0.28↓#8228↑0.83↑31.3 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%
$0.21↓#193800.81↑12.1 years↓
"This creature enters with a number of +1/+1 counters on it equal to the number of creature cards in all graveyards."
Mortivore82%
$0.32↑#5479↑0.14↓24.9 years
"this card's power and toughness are each equal to the number of creature cards in all graveyards."
Cruel Somnophage // Can't Wake Up78%
$0.44↑#4933↑0.23↓3.0 years↓
"Cruel Somnophage's power and toughness are each equal to the number of creature cards in all graveyards."
Drakestown Forgotten78%
$0.26↓#235230.27↓12.2 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↓#16203↑0.4010.1 years↓
"This creature gets +1/+1 for each creature card in your graveyard."
Necrogoyf76%
$0.32↑#3067↑0.395.3 years↓
"this card's power is equal to the number of creature cards in all graveyards."
Wight of Precinct Six75%
$0.16↓#9728↑0.11↓13.6 years↓
"This creature gets +1/+1 for each creature card in your opponents' graveyards."
Avatar Destiny70%
$0.32↑#11538↑0.00↓0.8 years↓
"Enchanted creature gets +1/+1 for each creature card in your graveyard and is an Avatar in addition to its other types."
Moon-Vigil Adherents70%
$0.25↓#10730↑0.00↓0.6 years↓
"This creature gets +1/+1 for each creature you control and each creature card in your graveyard."
Cantivore70%
$0.60↑#29461↓0.24↓24.9 years
"this card's power and toughness are each equal to the number of enchantment cards in all graveyards."