Heir of the Ancient Fang 
Creature — Snake Samurai
$0.04 #23300 0.00 4.5 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↑#15730↑0.004.5 years
"This creature gets +2/+0 for each other modified creature you control."
Expanding Ooze84%
$0.18↑#17527↑0.18↑2.2 years↓
"Whenever this creature attacks, put a +1/+1 counter on target modified creature you control."
Towashi Guide-Bot82%
$0.23↑#7545↑0.004.5 years
"When this creature enters, put a +1/+1 counter on target creature you control."
Ondu Knotmaster // Throw a Line82%
$0.15↑#197710.002.2 years↓
"Whenever another modified creature you control dies, put two +1/+1 counters on this creature."
Silver Sable, Mercenary Leader80%
$0.27↑#11219↑0.35↑1.0 years↓
"When this card enters, put a +1/+1 counter on another target creature."
SP//dr, Piloted by Peni80%
$0.25↑#6390↑0.32↑1.0 years↓
"When this card enters, put a +1/+1 counter on target creature."
Obstinate Gargoyle80%
$0.20↑#14397↑0.002.2 years↓
"This creature has flying as long as it's modified."
Chishiro, the Shattered Blade78%
$0.45↑#5951↑0.39↑4.5 years
"At the beginning of your end step, put a +1/+1 counter on each modified creature you control."
Costume Closet78%
$0.19↑#10577↑0.25↑1.0 years↓
"Whenever a modified creature you control leaves the battlefield, put a +1/+1 counter on this artifact."
Invigorating Hot Spring78%
$0.36↑#4675↑0.11↑4.5 years
"This enchantment enters with four +1/+1 counters on it."
Skyward Spider76%
$0.24↑#14960↑0.40↑1.0 years↓
"This creature has flying as long as it's modified."
Ivy Elemental70%
$0.15↑#17976↑0.19↑24.9 years↑
"This creature enters with X +1/+1 counters on it."
Endless One70%
$1.00↑#6024↑0.0510.9 years↑
"This creature enters with X +1/+1 counters on it."