X-23, Deadly Weapon 
Legendary Creature — Mutant Berserker Hero
$1.35 #21089 0.32 0.3 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 Frog90%
$0.24↓#14977↑0.360.6 years
"Whenever this card or another Mutant you control enters, create a Mutagen token."
Juniper Order Ranger88%
$0.15↓#8248↑0.18↓21.2 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%
$0.28↓#3546↑0.15↓7.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Celebrity Fencer84%
$0.20↓#187960.00↓4.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
EPF Point Squad84%
$0.07↓#223670.17↓0.6 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Mabel, Valley Hero79%
$0.20↓#219250.09↓0.0 years
"Whenever this card or another creature you control enters, put a +1/+1 counter on target creature that entered this turn."
Hulkling, Burgeoning Bruiser76%
$0.13↓#218620.19↓0.3 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."
Mighty Mutanimals76%
$0.19↓#16427↑0.260.6 years
"Whenever another creature you control enters, put a +1/+1 counter on target creature you control."
Skyknight Squire75%
$0.39↓#5062↑0.06↓1.9 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Durable Handicraft74%
$0.08↓#206000.07↓10.1 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%
$0.22↓#5407↑0.12↓1.4 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."
Anafenza, Kin-Tree Spirit74%
$0.26↓#6085↑0.06↓11.6 years↑
"Whenever another nontoken creature you control enters, bolster 1."
Serra Redeemer74%
$0.29↓#9063↑0.00↓4.1 years↑
"Whenever another creature you control with power 2 or less enters, put two +1/+1 counters on that creature."
Ivy Lane Denizen74%
$0.20↓#2484↑0.22↓13.7 years↑
"Whenever another green creature you control enters, put a +1/+1 counter on target creature."
Sigil Captain73%
$0.22↓#187480.00↓17.5 years↑
"Whenever a creature you control enters, if that creature is 1/1, put two +1/+1 counters on it."
Bloodline Pretender73%
$1.20↓#1906↑0.22↓5.7 years↑
"Whenever another creature you control of the chosen type enters, put a +1/+1 counter on this creature."
Hamletback Goliath73%
$0.20↓#9218↑0.06↓19.0 years↑
"Whenever another creature enters, you may put X +1/+1 counters on this creature, where X is that creature's power."
Warden of the Grove72%
$1.58↑#2192↑0.251.5 years↑
"Whenever another nontoken creature you control enters, it endures X, where X is the number of counters on this creature."
Champion of Lambholt72%
$2.83↑#584↑0.58↑14.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Rocksteady, Mutant Marauder72%
$0.23↓#9928↑0.290.6 years
"Whenever another nontoken creature you control enters, put a +1/+1 counter on target creature."