Originally posted by Big D
My plan is similar to Psychotic's.

Cloud - KotR + HP Absorb, Mime, W-Summon.

Enter battle with Cloud as the only live party member.
Immediately W-Summon KotR on Ruby's tentacles. They'll be annihilated by the first summon. The second one will target Ruby.
Mime until finished.

Every time the tentacles re-appear, KotR will revert to targeting them. HP Absorb will continually restore Cloud's HP.

Piece of cake!
Oh yeah, I forgot about targetting the tentacles first ^_^;;