I love Alarak's "Empower Me" in Starcraft 2, and feel there should be a LoL variant
"Empower Me" increases Alarak's AD and AP (so to speak) for every nearby allied unit, making him ridiculously strong when you have an army backing him up.
This mechanic would be awesome to have as an ultimate on a future Champion, maybe someone like a Slavemaster. I'd have it give a minor bonus for nearby allied minions, a slightly bigger bonus for this Champion's own pets, and a large bonus for nearby allied Champions. That could be awesome for team fight situations, and so far we don't have a Champion who does this sort of mechanic. Yorick sorta had it before his rework, but now he doesn't get such a benefit.
(I don't have a full concept to back this up, so don't say it belongs in Concepts & Creations.)
W. As for buffing ally champions, that was on the old Taric ult. No one ever noticed a difference when it was active.