Low effort, maybe say something in the range of: There should be a wheel that awards you with various rewards. For every week you are active you get one spin. Different rewards include 1 - 10 bil, nobs, xtals etc etc... You need to be much more descriptive then what your current post is.
If you're going to have ideas regarding premium items on a free game then you need to do a lucky dip scenario. There could be a lucky dip where you pay gold scaled for build. This could give commonly any pot, a uncommonly a single nobility point, rarely an xtal and rarely horns and seals. Then there could be a premium dip that costs 10 nobs for example and increases your chance of xtal or horns/seals but also gives more pots per win. This way ATA don't lose money overall and we still get a chance in a free game to win useful items