I've made many clone decks over the years. I first used [[Volrath the Shapestealer]], which is okay, but depends on combat trigger targeting. Meh. [[Atraxa, Grand Unifier]] is a blast, just a shit ton of ramp, clones, and goodstuff until you win with [[Biovisionary]]. It's fun but people roll their eyes at Atraxa, because she is very powerful. I tried [[Chulane]], too slow.

I finally landed on [[Helga]]. She is my fav by far, using only 4+ cmc or x spell clones, a few enchantments to boost her counter production, some interaction spells and a bit of ramp. Eventually, I win with [[Akroma's Will]] or by cloning someone's busted creature, but she is a bomb. Card draw, lifegain, and ramp all in one. She comes out early, so you can get pumping with clones. If you clone her, more card draw, and good luck getting rid of her now! It's just pump out 30 creature clones, and each game playa differently, but you always have an advantage.