Umbra Stalker 
Creature — Elemental
$0.45 #26673 0.00 18.2 years
Chroma — Umbra Stalker's power and toughness are each equal to the number of black mana symbols in the mana costs of cards in your graveyard.
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Cards similar to Umbra Stalker 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.
Crowd of Cinders89%
$0.17↓#282390.19↑18.5 years
"this card's power and toughness are each equal to the number of black permanents you control."
Boneyard Wurm88%
$0.11↓#14284↑0.0015.1 years↓
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Revenant87%
$0.06↓#19597↑0.39↑28.7 years↑
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Splinterfright86%
$0.25↓#5571↑0.17↑15.1 years↓
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Lord of Extinction86%
$0.77↑#3717↑0.20↑17.5 years
"this card's power and toughness are each equal to the number of cards in all graveyards."
Cognivore85%
$0.47↑#281430.0025.1 years↑
"this card's power and toughness are each equal to the number of instant cards in all graveyards."
Boneyard Mycodrax84%
$0.39↓#15573↑0.006.5 years↓
"this card's power and toughness are each equal to the number of other creature cards in your graveyard."
Old Stickfingers84%
$0.33↓#4154↑0.15↑5.1 years↓
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Lhurgoyf84%
$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."
Apocalypse Demon83%
$0.25↓#15742↑0.009.3 years↓
"this card's power and toughness are each equal to the number of cards in your graveyard."
Magnivore83%
$0.84↑#17805↑0.12↑25.1 years↑
"this card's power and toughness are each equal to the number of sorcery cards in all graveyards."
Consuming Blob82%
$0.40↓#12659↑0.41↑5.1 years↓
"this card's power is equal to the number of card types among cards in your graveyard and its toughness is equal to that number plus 1."
Cantivore82%
$0.63↑#297320.11↑25.1 years↑
"this card's power and toughness are each equal to the number of enchantment cards in all graveyards."
Sewer Nemesis82%
$1.00↑#6122↑0.25↑15.3 years↓
"this card's power and toughness are each equal to the number of cards in the chosen player's graveyard."
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."
Nightstalker Engine82%
$0.69↑#315800.0028.3 years↑
"this card's power is equal to the number of creature cards in your graveyard."
Slag Fiend82%
$0.20↓#258280.13↑15.4 years↓
"this card's power and toughness are each equal to the number of artifact cards in all graveyards."
Bloodsworn Squire // Bloodsworn Knight81%
$0.21↓#18948↑0.33↑4.9 years↓
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Terravore80%
$0.30↓#12345↑0.0625.1 years↑
"this card's power and toughness are each equal to the number of land cards in all graveyards."
Consuming Aberration79%
$0.21↓#1617↑0.69↑13.7 years↓
"this card's power and toughness are each equal to the number of cards in your opponents' graveyards."