There isn’t too much point about “a floor” to get rare legends since you can buy them with dust.
Anyway, if you like finding instead of buying, go 600+ M3 to get epiphany, defiant, etc.
Overall, you can try this:
- 500+ M3 to get ultra rare crystals, gold and many farmz, or…
- 180-200 M3 to collect as many dust as you can, then you start buying cheap eternal items to convert to ultra rare legends.
I personally like first option, since it’s pretty easy clearing an map in about 3 min solo and usually I get 1-2 ultra rare crystals per run, not mentioning that sometimes I get awesome eternal items.
Thanks for the tips bro.