Which champ do you love to have on your team?

A champion when you see get locked in, when your 1 game away from promos, and you think to yourself thank god.

Perhaps they have a good team fight, or they have great supporting skills, Or simply you just find them bad ass!

For example: Mine would be because I like the team fighting potential ult/synergy he has with a lot of champs, also you feel safe in his presence.

I know it can differentiate depending on the meta but generally, Let me know what you think is the greatest Ally have?