This is usually done with Ghosts since they offer a better cost:attack ratio. However, Mitosis invites a weakness to CC, which makes Ghost and Devonian strictly rush options. Therefore you see Mitosis Emerald Dragons just as often, since their 6 HP lets them survive the widely used Lightning. Gets even better upped with 9 HP on Jade Dragon.
Ghostosis doesn't need more than 4 Mitos and SoR's of course, and it almost always packs some RT's or Eternities for CC. Sometimes Golden Nymphs for potentially huge card advantage.