Serra Redeemer 
Creature — Angel Soldier
$0.29 #8829 0.28 4.0 years
Flying
Whenever another creature you control with power 2 or less enters, put two +1/+1 counters on that creature.
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Cards similar to Serra Redeemer 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.
Ezuri, Claw of Progress96%
$1.80↑#5626↑0.74↑10.8 years↑
"Whenever a creature you control with power 2 or less enters, you get an experience counter."
Vicious Clown92%
$0.11↓#19441↓0.00↓1.9 years↓
"Whenever another creature you control with power 2 or less enters, this creature gets +2/+0 until end of turn."
Neighborhood Guardian90%
$0.10↓#17691↓0.00↓2.6 years↓
"Whenever another creature you control with power 2 or less enters, target creature you control gets +1/+1 until end of turn."
Good-Fortune Unicorn90%
$0.20↓#3509↑0.17↓7.2 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Welcoming Vampire88%
$1.94↑#424↑0.224.8 years
"Whenever one or more other creatures you control with power 2 or less enter, draw a card. This ability triggers only once each turn."
+1 more matching line
Haazda Vigilante87%
$0.02↓#27483↓0.06↓2.6 years↓
"Whenever this creature enters or attacks, put a +1/+1 counter on target creature you control with power 2 or less."
Juniper Order Ranger86%
$0.15↓#79800.00↓21.0 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature."
Marketwatch Phantom84%
$0.03↓#25799↓0.272.6 years↓
"Whenever another creature you control with power 2 or less enters, this creature gains flying until end of turn."
Vesperlark84%
$0.28↓#16547↓0.07↓7.2 years↑
"Flying"
Mentor of the Meek83%
$0.14↓#647↑0.16↓14.9 years↑
"Whenever another creature you control with power 2 or less enters, you may pay 
. If you do, draw a card."
. If you do, draw a card."
Snarling Gorehound83%
$0.37↑#5117↑0.57↑2.6 years↓
"Whenever another creature you control with power 2 or less enters, surveil 1."
Irreverent Gremlin82%
$0.24↓#81460.14↓1.9 years↓
"Whenever another creature you control with power 2 or less enters, you may discard a card. If you do, draw a card. Do this only once each turn."
Tribute to the World Tree82%
$13.68↑#604↑0.42↑3.4 years
"Whenever a creature you control enters, draw a card if its power is 3 or greater. Otherwise, put two +1/+1 counters on it."
EPF Point Squad82%
$0.09↓#22564↓0.00↓0.5 years↓
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Celebrity Fencer82%
$0.17↓#18387↓0.234.4 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Dearly Departed82%
$0.13↓#15965↓0.05↓14.9 years↑
"Flying"
Mighty Emergence80%
$0.16↓#22035↓0.00↓17.9 years↑
"Whenever a creature you control with power 5 or greater enters, you may put two +1/+1 counters on it."
Shelinda, Yevon Acolyte80%
$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."
Overseer of Vault 7679%
$0.27↓#105050.372.5 years↓
"Whenever this card or another creature you control with power 3 or less enters, put a quest counter on this card."
Skyrider Patrol79%
$0.11↓#23353↓0.00↓8.1 years↑
"Flying"