Marvel Boy, Noh-Varr 

Legendary Creature — Kree Soldier Hero
$0.26 #26420 0.24 0.3 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.
Celebrity Fencer85%
$0.20↓#18796↑0.00↓4.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
EPF Point Squad85%
$0.07↓#223670.170.6 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Juniper Order Ranger82%
$0.15↓#8248↑0.1821.2 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 Unicorn79%
$0.28↑#3546↑0.157.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Hulkling, Burgeoning Bruiser76%
$0.13↓#218620.190.3 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."
Skyknight Squire76%
$0.39↑#5062↑0.06↓1.9 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Mabel, Valley Hero76%
$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."
Shelinda, Yevon Acolyte75%
$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."
Hamletback Goliath74%
$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."
Durable Handicraft74%
$0.08↓#20600↑0.07↓10.1 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↓#248500.00↓7.5 years↑
"Whenever a creature you control with power 4 or greater enters, put a +1/+1 counter on this creature."
Yorvo, Lord of Garenbrig74%
$0.29↑#9539↑0.37↑7.0 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%
$2.83↑#584↑0.58↑14.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
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."
Mighty Mutanimals73%
$0.19↓#16427↑0.260.6 years
"Whenever another creature you control enters, put a +1/+1 counter on target creature you control."
Soultether Golem73%
$0.20↓#271920.06↓19.5 years↑
"Whenever another creature you control enters, put a time counter on this creature."
Pelt Collector72%
$0.36↑#15214↑0.00↓8.0 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%
$0.13↓#239770.00↓4.5 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Loporrit Scout72%
$0.12↓#18974↑0.00↓1.4 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."