Cognivore 
Creature — Lhurgoyf
$0.46 #27786 0.21 24.9 years
Flying
Cognivore's power and toughness are each equal to the number of instant cards in all graveyards.
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Cards similar to Cognivore 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.
Magnivore94%
$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."
Lord of Extinction94%
$0.69↑#3690↑0.2617.3 years↓
"this card's power and toughness are each equal to the number of cards in all graveyards."
Lhurgoyf90%
$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."
Melek, Reforged Researcher90%
$0.54↑#12369↑0.292.6 years↓
"this card's power and toughness are each equal to twice the number of instant and sorcery cards in your graveyard."
Cantivore90%
$0.60↑#294610.2424.9 years
"this card's power and toughness are each equal to the number of enchantment cards in all graveyards."
Slag Fiend90%
$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."
Enigma Drake90%
$0.07↓#14192↑0.129.4 years↓
"this card's power is equal to the number of instant and sorcery cards in your graveyard."
Spellheart Chimera90%
$0.14↓#15606↑0.00↓12.9 years↓
"this card's power is equal to the number of instant and sorcery cards in your graveyard."
Revenant90%
$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."
Terravore89%
$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."
Boneyard Wurm89%
$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."
Mortivore88%
$0.32↓#5479↑0.1424.9 years
"this card's power and toughness are each equal to the number of creature cards in all graveyards."
Splinterfright88%
$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."
Kinetic Augur88%
$0.23↓#19114↑0.206.2 years↓
"this card's power is equal to the number of instant and sorcery cards in your graveyard."
Apocalypse Demon87%
$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."
Consuming Blob87%
$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."
Boneyard Mycodrax86%
$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."
Sewer Nemesis86%
$0.91↑#5977↑0.33↑15.2 years↓
"this card's power and toughness are each equal to the number of cards in the chosen player's graveyard."
Old Stickfingers86%
$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."
Umbra Stalker85%
$0.45↓#265010.2718.1 years↓
"this card's power and toughness are each equal to the number of black mana symbols in the mana costs of cards in your graveyard."