Aerith vs. Gilgamesh in 3 minutes or less! (or your money back)

I didn't beat Sephiroth this run, but I had me some fun. This build is FIRE!
Loadout
Ceremonial Staff
Cetran Bracer
Genji Gloves
🟢Healing 🟢Barrier 🟣Precision Defense Focus 🟣Skill Master 🟡Enemy Skill 🟡ATB Boost 🔴Phoenix
🔵🟢Elemental+Fire and Ice 🔵🟢Magic Focus+Fire 🔵🟢MP Absorbtion+Fire 🔵🟢Swiftcast+Fire
🔴Altruistic Buff Up 🔴Altruistic Buff Up 🔵Magic Attack Power +20 🟢Reprieve
Magic Focus is only level 4. I ain't grinding 18000 AP for a measly 5%... unless...?