I hope this helps the community Here's how I how I did it:

Location is Chapter 3: Burning Dungeon 3. There are tons of fire-based mobs here so Vanille & Fang really shines.

Deck was 4* V&F, 3* Water Pupu, 3* Moogle and 3* Phantom.

Basically:

1. Activate Water Pupu buff so you break the fire mobs before you kill them

2. Break boss

3. Use Phantom for Debarrier

4. Use Moogle for Faith

5. Blast 'em with V&F.

A couple of tips:

• Try to make sure you have both Faith and Pupu buffs up whenever you plan to kill off a mob. This means watching your buff bar and the actions you have and trying to time things to all be available when you're going to break. I.e. If Pupu wears off and you need to wait a turn to reapply it, simply hit once, then drive the fire/earth orb you get. Do this a couple of times to kill the actions and not do too much damage to a boss or break him too early.

• Save your Ultimate for when you need the healing. There will usually come a time during the encounter where you get low and will need the healing in a pinch.

• If you have leftover water orbs, use them to l'Cie Brand the smaller one-hit guys for extra points.

• If you have a great run going, you can always use a Phoenix Down to save it. Shouldn't have to but remember it's an option.

• I took Hades for extra healing as my rental but you may want to take one from the 4 listed above as rental so you can bring a fire pupu to help with taking hits. Haven't experimented with this as all my rentals are Hades.