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Nick Cave and the Bad Seeds – The Mercy Seat Lyrics 19 years ago
"My kill-hand is called E.V.I.L.
Wears a wedding band that's G.O.O.D.
Tis a long-suffering shackle
Collaring all that rebel blood"

"Kill-hand" may be a poker reference - under some rulesets in which the game is short but the stakes are high - but here I think it's simply a colourful name for his right hand, the one which would wield a weapon.

The E.V.I.L. / G.O.O.D. probably refers to knuckle tattoos, often sported by prisoners. That he's on death row would indicate he's had these applied during a former stretch in general population.

Wedding band would mean good and evil are inextricably linked, and the good balances the evil & somehow restrains it from getting (excuse the pun) out of hand. The lines following would support this idea.

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