Marvel Boy, Noh-Varr 

Legendary Creature — Kree Soldier Hero
$0.24 #26735 0.00 0.2 years
Whenever another creature you control enters and whenever you activate a power-up ability, put a +1/+1 counter on Marvel Boy.
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Cards similar to Marvel Boy, Noh-Varr 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.
EPF Point Squad85%
$0.09↓#225640.000.5 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Celebrity Fencer85%
$0.17↓#18387↑0.23↑4.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Juniper Order Ranger82%
$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 Unicorn79%
$0.20↓#3509↑0.17↑7.2 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Hulkling, Burgeoning Bruiser77%
$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 Squire76%
$0.47↑#5146↑0.16↑1.8 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Shelinda, Yevon Acolyte75%
$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."
Hamletback Goliath75%
$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."
Durable Handicraft74%
$0.11↓#20314↑0.009.9 years↑
"Whenever a creature you control enters, you may pay
. If you do, put a +1/+1 counter on that creature."
Kronch Wrangler74%
$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."
Yorvo, Lord of Garenbrig74%
$0.38↑#9364↑0.40↑6.9 years↑
"Whenever another green creature you control enters, put a +1/+1 counter on this card. Then if that creature's power is greater than this card's power, put another +1/+1 counter on this card."
Champion of Lambholt74%
$2.96↑#567↑0.58↑14.3 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
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."
Soultether Golem73%
$0.33↑#269930.0019.3 years↑
"Whenever another creature you control enters, put a time counter on this creature."
Boss's Chauffeur72%
$0.19↓#6475↑0.14↑4.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Pelt Collector72%
$0.40↑#14942↑0.40↑7.9 years↑
"Whenever another creature you control enters or dies, if that creature's power is greater than this creature's, put a +1/+1 counter on this creature."
Attended Socialite72%
$0.07↓#237440.054.4 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Loporrit Scout72%
$0.14↓#19003↑0.31↑1.2 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Beast-Kin Ranger72%
$0.09↓#15253↑0.15↑1.8 years↑
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."