... Ezuri, Renegade Leader is the best Elf in Standard. He is the win-condition in Standard Elves.
Since Ezuri, Renegade Leader is a legendary you may want to cut him back to 3. His ability IS insane, but I prefer Triumph of the Hordes . It only costs 4 to cast, and even though you're only giving a +1/+1 to all the Elves, the Infect in effectively giving all of them double power when you hit through.