Binding Agony (MIR 106)

Enchantment — Aura • Mana cost: {1}{B} • Mirage • Common

Enchant creature
Whenever enchanted creature is dealt damage, this Aura deals that much damage to that creature's controller.

A crash of rhinos in my head
—Femeref expression meaning "a severe head pain"

Illustrated by Robert Bliss.