User blog comment:Tinhboe/Elder Lizard vs Feral Flare/@comment-4888212-20140814085716/@comment-4888212-20140814121459

ult has CD. u dont use it just to smitesteal an enemy bluebuff. you do that with a ward. if you come from riverside, you cant ward the enemy bush without flare, so if you ward right into bluebuff, the enemy, should he be there, will know that you are there and has a chance to win the smite-wars.

and having a chance to get at least one of the 2 buffs everytime theyre up from the enemy gives you a HUGE lead in exp. and rengar scales just so damn well with exp.