Arni, Renowned Champion 
Legendary Creature — Human Berserker
$0.15 #26706 0.10 0.0 years
Trample
Whenever another creature you control enters, Arni gets +X/+0 until end of turn, where X is that creature's power.
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"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
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Crossroads Watcher90%
$0.13↓#19487↑0.150.7 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
+1 more matching line
Llanowar Stalker90%
$0.15#228520.064.1 years↑
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Beast-Kin Ranger90%
$0.19↑#15328↑0.051.9 years↑
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
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$0.09↓#315090.0521.2 years↑
"Whenever another creature you control enters, this creature gets +2/+2 until end of turn."
Bronzebeak Moa90%
$0.05↓#250820.0513.5 years↑
"Whenever another creature you control enters, this creature gets +3/+3 until end of turn."
Griffin Protector88%
$0.09↓#216010.00↓14.3 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
East Wind Avatar88%
$0.09↓#246140.070.6 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Hamletback Goliath88%
$0.20↑#9218↑0.0619.0 years↑
"Whenever another creature enters, you may put X +1/+1 counters on this creature, where X is that creature's power."
Shelinda, Yevon Acolyte86%
$0.22↑#5407↑0.121.4 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."
Devilish Valet84%
$0.32↑#3519↑0.24↑4.5 years↑
"Whenever another creature you control enters, double this creature's power until end of turn."
Saddled Rimestag84%
$0.12↓#218700.00↓7.4 years↑
"This creature gets +2/+2 as long as you had another creature enter the battlefield under your control this turn."
Fallaji Vanguard83%
$0.15#19973↑0.193.9 years↑
"Whenever this creature or another creature you control enters, target creature gets +2/+0 until end of turn."
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"Trample"
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$0.17↑#16780↑0.065.3 years↑
"Trample"
Eldrazi Mimic82%
$1.02↑#10767↑0.0710.7 years↑
"Whenever another colorless creature you control enters, you may have this creature's base power and toughness become equal to that creature's power and toughness until end of turn."
Earth King's Lieutenant80%
$0.32↑#7439↑0.160.9 years
"Trample"