Challenge: Recreate your job in equal or greater complexity using 12 or fewer actions

[Acidblood]

Ok, lets try this... White Mage (WHM):

1. Cure - Standard potency heal, low MP cost, 2.0s cast
__1.1 Cura - Mod. Cure, High potancy heal, high MP cost, 1.0s cast
2. Stone - Standard potency damage, moderate TP cost, 1.5s cast
3. Medica - Standard potency AoE heal, moderate MP cost, 2.0s cast
__3.1. Medicara - Mod. Medica, low potency AoE heal + low potency AoE HoT, high MP cost, 1.5s cast
4. Aero - Standard potency DoT, high TP cost, instant cast
__4.1 Aeroga - Mod. Aero, low potency AoE DoT, high TP cost, 2.5s cast
5. Raise - Resurrection spell, very high MP cost, 4.0s cast
6. Regen - Standard potency HoT, moderate MP cost, instant cast
__6.1 Asylum - Mod. Regen, ground target standard potency AoE HoT, oGCD, 60s cooldown
7. Blessing - Party buff with varying effects dependant on Cleric Stance and the amount of Faith / Bravery built (see Class Mechanic: Blessing). oGCD 45 second cooldown.
8. Benison - High potency heal, oGCD, 30s cooldown.
__8.1 Benediction - Mod. Benison, full heal, oGCD, 150s cooldown.
9. Cleric Stance - Stance, 10s cooldown on enter and exit, while active: lowers heal potency by 30% and lowers damage TP cost by 60%
10. Holy - High potency AoE damage + stun, very high TP cost, 1.5s cast
__10.1 Assize - Mod. Holy, high potency AoE damage + high potency AoE heal, oGCD, 60s cooldown
11. Stone Skin - Puts a shield on the target party member that absorbs 10% of the WHMs max HP in damage, moderate TP cost, instant cast
__11.1 Stone Skin - If used outside of combat the effect is applied to all party members (including self).
12. Inner Prayer - Channel, builds Faith, or Bravery if in Cleric Stance, while draining the other. Max 5.0s, interrupted by movement, high damage, or using an ability. 30s cooldown.

Class mechanic: Faith and Bravery
Faith and Bravery are two independent gauges (0 to 100%) that are built as the WHM casts spells, with the amount built based loosely on the cast time and cost of the spell.
By default, Faith is built whenever the WHM casts a useful spell (i.e. does healing, damage, or applies a buff), however if the WHM is in Cleric Stance then Bravery is built instead.

Class mechanic: Blessing
By default, Blessing applies up to +20% healing and +MP regen to the WHM for 20s, and up to +10% damage reduction to the party for 30s. Potency determined by Faith and uses all Faith.
If in Cleric Stance, Blessing applies +MP regen and +TP regen to the WHM for 20s, and up to +10% damage potency to the party for 15s. Potency determined by Bravery and uses all Bravery.

General design goals
The idea of White Mage is to be a simple healer, with basic healing and damage abilities, and a simple mechanic for providing party utility and buffs. The combination of Cleric Stance and Inner Prayer add some complexity to White Mage, allowing advanced players the push the class to its limits and provide maximum benefit to the party in any situation.

Damage abilites (and Stone Skin) have been changed to cost TP instead of MP, this not only makes TP useful, but allows the WHM to do DPS without cutting into their long term healing potential. The TP cost of damage abilities also acts as a natural limitation on a WHMs damage output, with Cleric Stance offering a modifier that greatly reduces this limitation without overpowering the WHMs DPS output.

NB. Keen eyed readers will notice the lack of Esuna; this is on purpose, as although it is an FF (and WHM) staple, I feel that it doesn't add significantly to gameplay in FFXIV and is more of a pain / obligation than anything, and as such could be removed.