Neighborhood Guardian 

Creature — Unicorn
$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.
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Cards similar to Neighborhood Guardian expected a card that isn't here?
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Vicious Clown96%
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"Whenever another creature you control with power 2 or less enters, this creature gets +2/+0 until end of turn."
Serra Redeemer90%
$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."
Ezuri, Claw of Progress89%
$1.80↑#5626↑0.74↑10.8 years↑
"Whenever a creature you control with power 2 or less enters, you get an experience counter."
Welcoming Vampire88%
$1.94↑#424↑0.22↑4.8 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."
Marketwatch Phantom86%
$0.03↓#25799↓0.27↑2.6 years
"Whenever another creature you control with power 2 or less enters, this creature gains flying until end of turn."
Mentor of the Meek85%
$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."
Irreverent Gremlin82%
$0.24↑#8146↑0.14↑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."
Fallaji Vanguard81%
$0.13↑#196700.003.8 years↑
"Whenever this creature or another creature you control enters, target creature gets +2/+0 until end of turn."
Boltwing Marauder80%
$0.18↑#190780.0911.4 years↑
"Whenever another creature you control enters, target creature gets +2/+0 until end of turn."
Enduring Innocence80%
$4.23↑#740↑0.29↑1.9 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."
Herd Gnarr80%
$0.08↓#31157↓0.50↑21.0 years↑
"Whenever another creature you control enters, this creature gets +2/+2 until end of turn."
Bronzebeak Moa80%
$0.05↓#24788↓0.43↑13.3 years↑
"Whenever another creature you control enters, this creature gets +3/+3 until end of turn."
Beast-Kin Ranger80%
$0.09↓#152530.15↑1.8 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Crossroads Watcher80%
$0.11↑#194950.000.6 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Mutant Town Musicians80%
$0.08↓#25590↓0.000.5 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Llanowar Stalker80%
$0.16↑#22410↓0.004.0 years↑
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Attended Socialite80%
$0.07↓#23744↓0.054.4 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Loporrit Scout80%
$0.14↑#190030.31↑1.2 years↓
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Slimy Dualleech79%
$0.09↓#27101↓0.24↑2.6 years
"At the beginning of combat on your turn, target creature you control with power 2 or less gets +1/+0 and gains deathtouch until end of turn."