What Would You Think of an Ability Like This?

Summon a wave of some mystical shit to rapidly travel down the target lane. All allied champions and minions it passes over gain health regeneration, movement speed, and damage reduction decaying over a few seconds. ("Regeneration" would really be a heal over time that just becomes weaker over the duration. Letting your team know it's on its way so you can initiate a fight the moment it passes overhead, or try to run away and catch it while disengaging.

Would it be an interesting idea to have an ability that specifically moves down a lane? Kind of like Yorick's ult, but an effect instead of a minion.