Skyknight Squire 
Creature — Cat Scout
$0.47 #5146 0.16 1.8 years
Whenever another creature you control enters, put a +1/+1 counter on this creature.
As long as this creature has three or more +1/+1 counters on it, it has flying and is a Knight in addition to its other types.
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Cards similar to Skyknight Squire expected a card that isn't here?
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EPF Point Squad93%
$0.09↓#22564↓0.00↓0.5 years↓
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Celebrity Fencer93%
$0.17↓#18387↓0.234.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Juniper Order Ranger90%
$0.15↓#7980↓0.00↓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."
Enduring Scalelord86%
$0.13↓#11165↓0.2011.4 years↑
"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."
Boss's Chauffeur86%
$0.19↓#6475↓0.144.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Good-Fortune Unicorn86%
$0.20↓#3509↑0.177.2 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Knight of Wundagore86%
$0.09↓#21078↓0.00↓0.2 years↓
"Whenever you put a +1/+1 counter on another creature, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Lightwalker84%
$0.02↓#27486↓0.0711.4 years↑
"This creature has flying as long as it has a +1/+1 counter on it."
Botanical Brawler84%
$0.32↓#6758↓0.27↑3.4 years↑
"Whenever one or more +1/+1 counters are put on another permanent you control, if it's the first time +1/+1 counters have been put on that permanent this turn, put a +1/+1 counter on this creature."
Pelt Collector82%
$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."
+1 more matching line
Hero of Bretagard81%
$0.33↓#13958↓0.06↓5.6 years↑
"As long as this creature has five or more counters on it, it has flying and is an Angel in addition to its other types."
Champion of Lambholt80%
$2.96↑#567↑0.58↑14.3 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Durable Handicraft79%
$0.11↓#20314↓0.00↓9.9 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."
Soultether Golem79%
$0.33↓#26993↓0.00↓19.3 years↑
"Whenever another creature you control enters, put a time counter on this creature."
Bess, Soul Nourisher79%
$0.86↑#10498↓0.234.4 years↑
"Whenever one or more other creatures you control with base power and toughness 1/1 enter, put a +1/+1 counter on this card."
Griffin Protector79%
$0.08↓#21281↓0.2514.1 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Attended Socialite79%
$0.07↓#23744↓0.05↓4.4 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Loporrit Scout79%
$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 Ranger79%
$0.09↓#15253↓0.151.8 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Crossroads Watcher79%
$0.11↓#19495↓0.00↓0.6 years↓
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."