Necropolis 
Artifact Creature — Wall
$2.16 #24344 0.27 32.1 years
Defender (This creature can't attack.)
Exile a creature card from your graveyard: Put X +0/+1 counters on this creature, where X is the exiled card's mana value.
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Cards similar to Necropolis 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.
Shield Sphere95%
$10.28↑#4070↑0.1830.2 years↓
"Defender"
Wall of Shields92%
$0.34↓#236510.59↑31.3 years
"Defender"
Wall of Spears92%
$0.11↓#235540.2432.5 years
"Defender"
Living Wall88%
$0.32↓#197430.00↓33.1 years
"Defender"
Wall of Resistance86%
$0.23↓#216860.1929.9 years↓
"Defender"
Wall of Roots86%
$0.19↓#3598↑0.16↓29.9 years↓
"Defender"
Shifting Wall84%
$0.35↓#12700↑0.38↑28.5 years↓
"Defender"
Walking Wall84%
$0.19↓#254770.2431.3 years
"Defender"
Mobile Fort82%
$0.32↓#254000.2427.9 years↓
"Defender"
Snow Fortress80%
$0.59↓#260050.07↓31.3 years
"Defender"
Frankenstein's Monster77%
$8.00↑#288230.3532.1 years
"As this creature enters, exile X creature cards from your graveyard. If you can't, put this creature into its owner's graveyard instead of onto the battlefield. For each creature card exiled this way, this creature enters with a +2/+0, +1/+1, or +0/+2 counter on it."
Blistering Barrier75%
$0.12↓#282290.3629.9 years↓
"Defender"
Wall of Ice75%
$0.31↓#17029↑0.00↓33.1 years
"Defender"
Custodian of the Trove75%
$0.04↓#275320.00↓11.4 years↓
"Defender"
Archers of Qarsi75%
$0.05↓#254890.2211.6 years↓
"Defender"
Wall of Wood75%
$0.08↓#241900.07↓33.1 years
"Defender"
Fortified Rampart75%
$0.25↓#9740↑0.00↓10.9 years↓
"Defender"
Carnivorous Plant75%
$0.10↓#283910.2432.1 years
"Defender"
Murmuring Phantasm75%
$0.10↓#19136↑0.00↓13.3 years↓
"Defender"
Wall of Mist75%
$0.10↓#15493↑0.338.1 years↓
"Defender"