Auto-Support is shielding/healing your allies without any clickling. In one of my matches I decided to go with Aery for once, it turned out awesome if I have to say so.

I realised that our E ability triggers Aery which triggers our support items, buffing your alies in a area with those items (speeding them also procs the items). So here we are with a team-player Senna instead of a damage support.