I'll assume you have some programming background since your probing around for engines.
i need wich one that can render millions voxel-like objects with out any problems.
That's subjective and ultimately depends on the system that will be executing the build and the overall complexity of the App.
Several factors also weigh into your previous request
-lighting (will your minecraft clone have lighting? If so it adds another layer of calculations for each cube or mesh. (I think, could be mistaken though; MC utilized lightmaps as opposed to the per-vertex lighting available in Fixed Function GL))
-Run-time world-gen (will your world dynamically be generated as the program runs as mineCraft is?)
-Networking (I would say this is a must if you looking to make MineCraft clone)
And that's the VERY tip of the ice-berg. All of these things MineCraft has (In some form or another). Pinpoint your needs and your projected end-goal, and try choosing an egine based upon that