Mob Mentality 
Enchantment — Aura
$0.31 #22108 0.24 29.6 years
Enchant creature
Enchanted creature has trample.
Whenever all non-Wall creatures you control attack, enchanted creature gets +X/+0 until end of turn, where X is the number of attacking creatures.
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+1 more matching line
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"Whenever equipped creature attacks alone, it gets +1/+1 until end of turn for each other creature you control."
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$0.33↑#4762↑0.183.8 years↓
"Enchanted creature gets +2/+0 and has trample."
+1 more matching line
Bast, Panther Goddess71%
$1.19↑#13478↑0.00↓0.2 years↓
"Whenever you attack, target attacking creature gets +X/+X until end of turn, where X is the number of creatures you control."
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"Whenever a creature you control attacks, it gets +2/+2 until end of turn."
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$0.03↓#261220.336.6 years↓
"Whenever another creature you control attacks, it gets +0/+1 until end of turn."
Cartouche of Strength70%
$0.17↓#10499↑0.169.4 years↓
"Enchanted creature gets +1/+1 and has trample."