Stubborn Burrowfiend 
Creature — Badger Beast Mount
$0.14 #20132 0.22 2.4 years
Whenever this creature becomes saddled for the first time each turn, mill two cards, then this creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard.
Saddle 2 (Tap any number of other creatures you control with total power 2 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)
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Cards similar to Stubborn Burrowfiend 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.
Liliana's Elite86%
$0.21↑#162030.40↑10.1 years↑
"This creature gets +1/+1 for each creature card in your graveyard."
Moldgraf Millipede86%
$0.12↓#9421↑0.35↑4.8 years↑
"When this creature enters, mill three cards, then put a +1/+1 counter on this creature for each creature card in your graveyard."
Siegfried, Famed Swordsman84%
$0.19↑#7544↑0.211.2 years↓
"When this card enters, mill three cards. Then put X +1/+1 counters on this card, where X is twice the number of creature cards in your graveyard."
Venomsac Lagac83%
$0.16↑#191860.171.6 years
"Saddle 2"
+1 more matching line
Madame Hydra, Reanimated83%
$0.58↑#238160.00↓0.2 years↓
"this card gets +1/+1 for each creature card in your graveyard."
Alacrian Jaguar82%
$0.14#220600.141.6 years
"Saddle 1"
+1 more matching line
Bridled Bighorn82%
$0.12↓#182140.00↓2.4 years
"Saddle 2"
Gilded Ghoda82%
$0.23↑#13408↑0.161.6 years
"Saddle 1"
Rhizome Lurcher80%
$0.17↑#180100.277.9 years↑
"This creature enters with a number of +1/+1 counters on it equal to the number of creature cards in your graveyard."
Drover Grizzly80%
$0.13↓#10374↑0.00↓2.4 years
"Saddle 1"
Moon-Vigil Adherents80%
$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."
Golgari Raiders80%
$0.20↑#217350.00↓7.9 years↑
"This creature enters with a +1/+1 counter on it for each creature card in your graveyard."
Bulwark Ox80%
$0.30↑#7021↑0.181.6 years
"Saddle 1"
Archmage's Newt80%
$0.17↑#13455↑0.00↓2.4 years
"Saddle 3"
Caustic Bronco80%
$0.36↑#6560↑0.04↓2.4 years
"Saddle 3"
Quilled Charger79%
$0.05↓#25866↓0.00↓2.4 years
"Saddle 2"
+1 more matching line
Giant Beaver79%
$0.14#187500.00↓2.4 years
"Saddle 3"
Graverobber Spider79%
$0.13↓#179160.2112.6 years↑
"
: This creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard. Activate only once each turn."
: This creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard. Activate only once each turn."
Brightfield Glider78%
$0.11↓#199710.10↓1.6 years
"Saddle 3"
Wall of Tombstones78%
$6.37↑#28689↓0.00↓32.3 years↑
"At the beginning of your upkeep, change this creature's base toughness to 1 plus the number of creature cards in your graveyard."