FF7 Ruby Weapon - Knights of the Round / Mime Strategy

Make sure to enter this battle with 2 party members dead. This causes Ruby to stick it's hands into the ground and open itself for damage.
Cast Knights of the Round paired with HP Absorb and W-Summon.
Mime
Mime
Mime
See the beginning of the video for materia pairs. Make sure to pair mime with counter. This will add to the chain when getting attacked. Also pairing Phoenix with Final Attack serves as a last resort. If Ruby happens to kill you, Phoenix will be cast and your party will be revived automatically.