Heir of the Ancient Fang 
Creature — Snake Samurai
$0.06 #23738 0.00 4.7 years
This creature enters with a +1/+1 counter on it if you control a modified creature. (Equipment, Auras you control, and counters are modifications.)
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Cards similar to Heir of the Ancient Fang 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.
Upriser Renegade84%
$0.17↑#16094↑0.004.7 years
"This creature gets +2/+0 for each other modified creature you control."
Expanding Ooze84%
$0.17↑#17534↑0.072.3 years↓
"Whenever this creature attacks, put a +1/+1 counter on target modified creature you control."
Towashi Guide-Bot84%
$0.23↑#7702↑0.064.7 years
"When this creature enters, put a +1/+1 counter on target creature you control."
Ondu Knotmaster // Throw a Line82%
$0.15↑#201320.062.3 years↓
"Whenever another modified creature you control dies, put two +1/+1 counters on this creature."
SP//dr, Piloted by Peni82%
$0.28↑#6055↑0.001.1 years↓
"When this card enters, put a +1/+1 counter on target creature."
Chishiro, the Shattered Blade81%
$0.44↑#6130↑0.19↑4.7 years
"At the beginning of your end step, put a +1/+1 counter on each modified creature you control."
Obstinate Gargoyle80%
$0.20↑#14408↑0.10↑2.3 years↓
"This creature has flying as long as it's modified."
Costume Closet78%
$0.22↑#10462↑0.001.1 years↓
"Whenever a modified creature you control leaves the battlefield, put a +1/+1 counter on this artifact."
Invigorating Hot Spring77%
$0.34↑#4813↑0.12↑4.7 years
"This enchantment enters with four +1/+1 counters on it."
Silver Sable, Mercenary Leader77%
$0.26↑#11002↑0.001.1 years↓
"When this card enters, put a +1/+1 counter on another target creature."
Skyward Spider76%
$0.22↑#14960↑0.001.1 years↓
"This creature has flying as long as it's modified."