Stubborn Burrowfiend 
Creature — Badger Beast Mount
$0.16 #20640 0.00 2.5 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↑#16312↑0.11↑10.2 years↑
"This creature gets +1/+1 for each creature card in your graveyard."
Moldgraf Millipede86%
$0.12↓#9735↑0.25↑4.9 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%
$0.28↑#7347↑0.27↑1.4 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%
$0.17↑#192810.001.7 years
"Saddle 2"
+1 more matching line
Madame Hydra, Reanimated82%
$0.24↑#226010.29↑0.3 years↓
"this card gets +1/+1 for each creature card in your graveyard."
Alacrian Jaguar82%
$0.17↑#221990.29↑1.7 years
"Saddle 1"
+1 more matching line
Bridled Bighorn82%
$0.15↓#186410.002.5 years
"Saddle 2"
Gilded Ghoda82%
$0.19↑#13190↑0.001.7 years
"Saddle 1"
Rhizome Lurcher81%
$0.18↑#184280.33↑8.0 years↑
"This creature enters with a number of +1/+1 counters on it equal to the number of creature cards in your graveyard."
Golgari Raiders80%
$0.18↑#221220.19↑8.0 years↑
"This creature enters with a +1/+1 counter on it for each creature card in your graveyard."
Moon-Vigil Adherents80%
$0.22↑#10450↑0.17↑0.7 years↓
"This creature gets +1/+1 for each creature you control and each creature card in your graveyard."
Quilled Charger80%
$0.04↓#26194↓0.072.5 years
"Saddle 2"
+1 more matching line
Bulwark Ox80%
$0.31↑#6887↑0.051.7 years
"Saddle 1"
Archmage's Newt80%
$0.19↑#13664↑0.002.5 years
"Saddle 3"
Giant Beaver80%
$0.13↓#192370.25↑2.5 years
"Saddle 3"
Brightfield Glider79%
$0.11↓#200770.001.7 years
"Saddle 3"
Graverobber Spider79%
$0.14↓#184150.0012.7 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."
Caustic Bronco78%
$0.34↑#6652↑0.19↑2.5 years
"Saddle 3"
Drover Grizzly78%
$0.16#10446↑0.002.5 years
"Saddle 1"
Wall of Tombstones78%
$5.27↑#29026↓0.0032.4 years↑
"At the beginning of your upkeep, this creature's base toughness becomes equal to 1 plus the number of creature cards in your graveyard."