Insolence 

Enchantment — Aura
Enchant creature
Whenever enchanted creature becomes tapped, this Aura deals 2 damage to that creature's controller.
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Cards that do something similar expected a card that isn't here?
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Lust for War 99%
$0.15#25460
"Whenever enchanted creature becomes tapped, this Aura deals 3 damage to that creature's controller."
+1 more matching line
Seizures 91%
$0.13#23872
"Whenever enchanted creature becomes tapped, this Aura deals 3 damage to that creature's controller unless that player pays {3}."
+1 more matching line