Best Utility / Nondamage Skill

Please post at least 3 favorite skills if you're going to post :)

Discuss your favorite utility/cc skill that is not primarily used for damage, some examples:

Lulu W, R Tahm W/R Thresh Q,W Bard E/R Morg E Karma (R + E) Nautilus R Anivia W Varus R Soraka E, R Yasuo W Ryze R Poppy R Taric R

My favorite lately is Tahm W, although it has huge potential downside, it counters tons of other skills depending on how it's used: Almost any bad positioning that causes a teammate's death can be saved with W'ing them. Lulu's ult can also be used in those situations if they are surrounded.

Morg I really like her E for blocking CC and preventing Karthus ult on low allies.