The End of the Rainbow (Four of Clubs)

This puzzle involves completing limericks with palidromes (words that are mirror images, and read the same backwards and forwards, like "RACECAR" or "A MAN, A PLAN, A CANAL, PANAMA!").

A few (non-spoilery) tips:

1) The palindromes are part of limericks, when the rhyming scheme AABBA (The first, second, and fifth lines rhyme, and the third and fourth lines rhyme). This means you can often figure out some missing words by guessing what completes the rhyme.

2) Since they are palindromes, whenever you do figure out a letter, you have figured out the other letter on the opposite side! Figure out a whole word, and the phrase is half-finished!

Hints & Solutions
Hint for phrase 1 Remembering the name of Medusa's sisters will be a great start.

Solution for phrase 1 Medusa has sisters you can't see Unless you can use scyphomancy. Quickly conjure some booze As it's liquor they choose. When there's no grog, (a) Gorgon gets antsy.

Hint for phrase 2 Think of what kinds of "giants" and "entrails" would fit in the blanks and rhyming scheme.

Solution for phrase 2 The boatmen unfurled their sails To gather up giants' entrails. They set off downriver, To get ogre live(r), Evil ergo won't win, say the tales.

Hint for phrase 3 What kind of "green" place has a serpent been known to cause trouble? And what other animal was identified as that serpent?

Solution for phrase 3 A lone serpent goes out for some air, Destroying each fertile green square. His intentions are rotten. He Is no sort for botany. No garden (o)ne dragon will spare.

Hint for phrase 4 Who would 'Ma' be talking to? And what would a Grecian sky-rider use?

Solution for phrase 4 Ma was the wife of a miser, A Grecian sky-rider's advisor. Once she asked of the sage, "Did a pegas(u)s age?" Pa did not know. She stayed none the wiser.

Hint for phrase 5 What is another word for stags and hinds? What is a mythical giant bird (that is not a phoenix)?

Solution for phrase 5 A colossal bird lives on my farm Where stags and hinds cause lots of harm. Now her chicks get forlorn As the deer gain roc(s)' corn. I agreed when they raised the alarm.

Hint for phrase 6 Figure out what a lyncanthrope is and you are almost done!

Solution for phrase 6 Do not enter the lycanthrope's place Or I might take a shine to your face. I will bite nice and slow So your blood starts to flow, ere w(e) werewolf types cut to the chase.

Keyword solution Taking the letters in parentheses from each completed phrase, you get the keyword: AROUSE.