X-23, Deadly Weapon 
Legendary Creature — Mutant Berserker Hero
$1.65 #21974 0.00 0.2 years
Whenever another Mutant you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on X-23.
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Cards similar to X-23, Deadly Weapon 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.
Genghis Frog88%
$0.20↓#15209↑0.000.5 years
"Whenever this card or another Mutant you control enters, create a Mutagen token."
Juniper Order Ranger88%
$0.15↓#7980↑0.0021.0 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature."
Good-Fortune Unicorn86%
$0.20↓#3509↑0.17↑7.2 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
EPF Point Squad84%
$0.09↓#225640.000.5 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Celebrity Fencer84%
$0.17↓#183870.23↑4.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Hulkling, Burgeoning Bruiser76%
$0.19↓#225390.000.2 years
"Whenever another creature you control enters, if it has greater power or toughness than this card, put a +1/+1 counter on this card."
Skyknight Squire75%
$0.47↓#5146↑0.16↑1.8 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Durable Handicraft74%
$0.11↓#203140.009.9 years↑
"Whenever a creature you control enters, you may pay 
. If you do, put a +1/+1 counter on that creature."
. If you do, put a +1/+1 counter on that creature."
Shelinda, Yevon Acolyte74%
$0.25↓#5586↑0.47↑1.2 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature if its power is less than this card's power. Otherwise, put a +1/+1 counter on this card."
Serra Redeemer74%
$0.29↓#8829↑0.28↑4.0 years↑
"Whenever another creature you control with power 2 or less enters, put two +1/+1 counters on that creature."
Bloodline Pretender74%
$1.55↓#1854↑0.18↑5.6 years↑
"Whenever another creature you control of the chosen type enters, put a +1/+1 counter on this creature."
Sigil Captain73%
$0.20↓#183300.56↑17.3 years↑
"Whenever a creature you control enters, if that creature is 1/1, put two +1/+1 counters on it."
Mighty Mutanimals73%
$0.15↓#16852↑0.000.5 years
"Whenever another creature you control enters, put a +1/+1 counter on target creature you control."
Hamletback Goliath73%
$0.19↓#9036↑0.0018.9 years↑
"Whenever another creature enters, you may put X +1/+1 counters on this creature, where X is that creature's power."
Kronch Wrangler72%
$0.04↓#245440.007.3 years↑
"Whenever a creature you control with power 4 or greater enters, put a +1/+1 counter on this creature."
Warden of the Grove72%
$1.60↓#2265↑0.19↑1.4 years↑
"Whenever another nontoken creature you control enters, it endures X, where X is the number of counters on this creature."
Earth King's Lieutenant72%
$0.29↓#7593↑0.000.8 years
"Whenever another Ally you control enters, put a +1/+1 counter on this creature."
Champion of Lambholt72%
$2.96↑#567↑0.58↑14.3 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Anafenza, Kin-Tree Spirit72%
$0.22↓#5870↑0.0511.4 years↑
"Whenever another nontoken creature you control enters, bolster 1."
Nesting Dovehawk72%
$22.22↑#3080↑0.34↑3.4 years↑
"Whenever a creature token you control enters, put a +1/+1 counter on this creature."