Umbra Stalker 
Creature — Elemental
$0.45 #26501 0.27 18.1 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↓#278090.2918.3 years
"this card's power and toughness are each equal to the number of black permanents you control."
Boneyard Wurm88%
$0.13↓#13981↑0.2914.9 years↓
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Revenant87%
$0.06↓#19255↑0.2528.6 years↑
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Splinterfright86%
$0.29↓#5369↑0.2414.9 years↓
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Lord of Extinction86%
$0.69↑#3690↑0.2617.3 years
"this card's power and toughness are each equal to the number of cards in all graveyards."
Cognivore85%
$0.46↑#277860.2124.9 years↑
"this card's power and toughness are each equal to the number of instant cards in all graveyards."
Boneyard Mycodrax84%
$0.30↓#15271↑0.05↓6.4 years↓
"this card's power and toughness are each equal to the number of other creature cards in your graveyard."
Old Stickfingers84%
$0.29↓#3986↑0.184.9 years↓
"this card's power and toughness are each equal to the number of creature cards in your graveyard."
Lhurgoyf84%
$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."
Apocalypse Demon83%
$0.27↓#15704↑0.53↑9.1 years↓
"this card's power and toughness are each equal to the number of cards in your graveyard."
Magnivore83%
$0.87↑#17369↑0.2524.9 years↑
"this card's power and toughness are each equal to the number of sorcery cards in all graveyards."
Consuming Blob82%
$0.39↓#12702↑0.55↑4.9 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%
$0.60↑#294610.2424.9 years↑
"this card's power and toughness are each equal to the number of enchantment cards in all graveyards."
Sewer Nemesis82%
$0.91↑#5977↑0.3315.2 years↓
"this card's power and toughness are each equal to the number of cards in the chosen player's graveyard."
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."
Nightstalker Engine82%
$0.74↑#312480.3528.2 years↑
"this card's power is equal to the number of creature cards in your graveyard."
Slag Fiend82%
$0.20↓#254710.00↓15.3 years↓
"this card's power and toughness are each equal to the number of artifact cards in all graveyards."
Terravore80%
$0.27↓#11981↑0.2824.9 years↑
"this card's power and toughness are each equal to the number of land cards in all graveyards."
Consuming Aberration79%
$0.20↓#1606↑0.58↑13.6 years↓
"this card's power and toughness are each equal to the number of cards in your opponents' graveyards."
Souls of the Lost79%
$0.31↓#9902↑0.47↑2.8 years↓
"this card's power is equal to the number of permanent cards in your graveyard and its toughness is equal to that number plus 1."