Recalling back before the launch of EW, Yoshi P mentioned that they're adding an extra thing for healers to manage, we now know he meant stuff like Aquaveil, Protraction and Exaltation. But that gave me some ideas, what if it was something different? Every example skill given will be on the GCD:

WHM
Thorns: [1s cast] [2.5s recast] [25s CD] Applies a buff on target ally which causes the next 4 hits taken to reflect damage equivalent to 80 potency.

SCH
Focus Fire Tactics: [1.5s cast] [2.5s recast] [30s CD] Attacks an enemy for 100 potency and grants a buff to all nearby allies in a 15y radius that causes their next attack to echo for a guaranteed critical 30 potency damage.

AST
Crossed Fates: [Instant cast] [2.5s recast] [40s CD] Applies a buff to selected ally that allows them to receive the very next card effect applied as if it was also applied to them directly. (So if you apply this buff to a ranged job and your very next card used is Balance on a melee, the ranged job will gain 3%)

SGE
(Idk what to name this): [Instant cast] [1s recast] Sends a noulith to a selected ally, granting them a buff that enhances their next 5 attacks with 65 potency of damage and also granting them a buff that causes the next Eukrasian Diagnosis to also apply to them at 50% of the effect (Both buffs last 30s, ability cannot be used again unless both buffs are consumed or timed out).