White Mage.

You can spam Cure, Cure II, Medica II and clear any content below Savage.

Throw in some Stone or Holy if there's nothing to heal and there's your 4 button rotation.

As for macros,

/micon "Stone"
/merror off
/ac "Stone" <t>
/ac "Stone" <tt>

And

/micon "Aero"
/merror off
/ac "Aero" <t>
/ac "Aero" <tt>

Is all you need, this allows you to use DPS abilities as long as you're targeting an ally and said ally is targeting an enemy.