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I come both good, a sacrifice,

And bad, and black as plummet prices

Crash into a shore deserted,

As you find a tribe perverted,

Take me to your side, take of your suit,

Today a casual commute.

'Oh no, I certainly don't like sacrifices. Why would that be good?'
'It is often a good thing to make sacrifice. You should know that as you welcome prey.'

Riddle Answer Friday

Riddle Explanation
I come both good, a sacrifice - Good Friday is the Friday before Easter in the Christian calendar that signifies the crucifixion of Christ.

and bad, and black as plummet prices crash - Black Friday, a day of economic catastrophe. Coined from market collapse in 1869 when Jay Gould and James Fisk tried to corner the gold market.

crash into a shore deserted, as you find a tribe perverted, take me to your side - a main character in Daniel Defoe's novel Robinson Crusoe, and the origin of the phrase Man Friday, a reliable man-servant.

girl Friday, an efficient and loyal female assistant in reference the Man Friday.

take of your suit, today a casual commute - casual Friday, a day at work where casual attire may be worn.