Master Yi's Q.

Ashe's Hawkshot

Katarina Bouncing Blades or Shunpo.... hard to choose

Nidalee's Q. Buy Unholy Grail for mana regen, spam infinite spears forever. Trying to run away will only kill you faster.

Are these with, or without mana cost? With: Kat's Shunpo. Without: Nocturne's spell shield.

Varus's Piercing arrow (if it had insta charge and went all the way across the map and cost no mana)

Any mobility spell (especially Ezreal's E, Fizz's E, and Leblanc's W)
Spell shields (Nocturne/Sivir's)
Pretty much any CC effect
Grabs (Blitzcrank and Nautilus)
And, of course, Garen's E.

Teemo shrooms

EDIT: I forgot no ults, so sorry, change that to singed W

Or soraka heal/silence. Either never die or never let the enemy cast spells >

Lulu's Whimsy SQUIRRELS SQUIRRELS FOR EVERYONE