Less cost, useable by all quanta types, fits anywhere. (Splintered Psions anyone?)
But I think this card is even more powerful than the original mitosis
1. It's cheaper
2. It can be used in any deck
3. It gives stats to copies. What will happen if you use it on Deathstalker / Dune scorpions / Voodoo Dolls / Wardens. These creatures are made to have zero initial attack for balance.
Voodoo dolls aren't really a problem, just 1/2 attack is fine. Dstalker and Dune both are blocked by shields easily, assuming you packed one. If not, then the opponent/you get lucky. Wardens are pretty much the same as Dstalker/Dune, just a little dangerous. Bit like Parasites/Pests or whatever.
It's pretty situational.
They're also equal in a sense, because you can have either same stat creatures(dragon spell, anyone?) and abilities, or shadow copies and abilities. Your choice.