Clarity

The end all Summoner's Spell in League of Legends.

If you ever lost a game it was because you didn't have a 5-man Clarity

Clarity too stronk
As of patch 124/124.1241.124whogivesafuck, Clarity was removed from Summoner's Rift...

HA BUT JOKES ON YOU, RITO. WE ONLY PLAY ARAM, AND IT'S STILL ON ARAM.

...

Why do we only play ARAM?

Still though, if you don't bring Clarity to ARAM it's pretty much equivalent to bringing only one clip of ammo to a war zone.

Bot-Lane Smite
During a fight for Dragon, while the enemy team is off being a bunch of fuckwad cock-blockers against your team's jungler, you can be like a certain BAD ASS MOTHERFUCKER and steal Dragon with your bot-lane smite. They will never see it coming.