Regarding Potential on an "End Game" Weapon...

What is the ideal potential for an "end game" weapon. I'm not very rich but right now I have a 3 lined epic Reverse Executioners with

15% def ignore,

3% damage,

and some random pot.

I was thinking that MY ideal plan for cubing (since I'm rich in neither the real world or the maple world) would be to slowly cube this every now and then until it gets to unique (does anyone know how many cubes this approximately takes/ has taken?), then when I get there, look for something like

30% def ignore

30% boss damage

Any of the upper two lines || + x weapon attack || + x% damage

Is the combination(s) I mentioned above even possible? And also, does this sound like a reasonable plan?

As a side note, I haven't scrolled it yet, but I plan to have it perfectly scrolled by January 31, and there's no chance of it blowing up so I don't have to worry about getting an awesome potted weapon then blowing it up while scrolling it.