Mob Mentality 
Enchantment — Aura
$0.31 #22442 0.12 29.7 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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Cards similar to Mob Mentality expected a card that isn't here?
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+1 more matching line
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+1 more matching line
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"Whenever you attack, target attacking creature gets +X/+X until end of turn, where X is the number of creatures you control."