Fractal Harness 
Artifact — Equipment
$0.25 #6379 0.29 5.5 years
When this Equipment enters, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it and attach this Equipment to it.
Whenever equipped creature attacks, double the number of +1/+1 counters on it.
Equip
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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.
Seismic Tutelage91%
$0.90↑#11095↓0.310.9 years↓
"Whenever enchanted creature attacks, double the number of +1/+1 counters on it."
Sword of Hours90%
$5.43↑#5102↑0.00↓5.2 years
"Whenever equipped creature attacks, put a +1/+1 counter on it."
+1 more matching line
Kyoshi Battle Fan87%
$0.14↓#12448↓0.230.9 years↓
"When this Equipment enters, create a 1/1 white Ally creature token, then attach this Equipment to it."
+1 more matching line
Wooden Cane87%
$0.22↓#29060↓0.11↓0.6 years↓
"When this Equipment enters, create a 2/2 red Mutant creature token, then attach this Equipment to it."
+1 more matching line
Dwarven Shortsword87%
$0.13↓#14305↓0.06↓0.2 years↓
"When this Equipment enters, create a 2/2 red Dwarf creature token, then attach this Equipment to it."
+1 more matching line
Ornery Tumblewagg86%
$0.36↑#51810.222.5 years↓
"Whenever this creature attacks while saddled, double the number of +1/+1 counters on target creature."
Lily Bowen, Raging Grandma86%
$0.46↑#70800.252.6 years↓
"this card enters with two +1/+1 counters on it."
+1 more matching line
Byrke, Long Ear of the Law85%
$7.22↑#60290.14↓2.2 years↓
"Whenever a creature you control with a +1/+1 counter on it attacks, double the number of +1/+1 counters on it."
Monk's Fist85%
$0.15↓#13463↓0.00↓1.4 years↓
"Equip "
"
Flayer Husk85%
$0.20↓#11975↓0.06↓15.7 years↑
"Equip "
"
Primordial Hydra84%
$1.37↑#2429↑0.55↑15.3 years↑
"This creature enters with X +1/+1 counters on it."
+1 more matching line
Ancestral Blade84%
$0.09↓#12812↓0.18↓7.3 years↑
"When this Equipment enters, create a 1/1 white Soldier creature token, then attach this Equipment to it."
+1 more matching line
Hydra's Growth84%
$1.23↑#2156↑0.346.7 years↑
"At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature."
Necropouncer84%
$0.12↓#20604↓0.12↓15.4 years↑
"Equip "
"
Mossborn Hydra84%
$13.45↑#747↑0.95↑1.9 years↓
"This creature enters with a +1/+1 counter on it."
Blade of Shared Souls84%
$0.25#12362↓0.06↓3.7 years↓
"Equip "
"
Skinwing83%
$0.08↓#16759↓0.00↓15.7 years↑
"Equip 
"
"
Bone Sabres82%
$4.79↑#61140.07↓4.0 years↓
"Whenever equipped creature attacks, put four +1/+1 counters on it."
Armory of Iroas82%
$0.23↓#8026↓0.2712.5 years↑
"Whenever equipped creature attacks, put a +1/+1 counter on it."
+1 more matching line
Headsplitter82%
$0.18↓#17242↓0.07↓2.3 years↓
"When this Equipment enters, create a 1/1 black Assassin creature token with menace, then attach this Equipment to it."
+1 more matching line