You should splash red and include some mountains Sacred Foundry so that you can use Chained to the Rocks or some other form of removal. It will also give you access to the "anti board wipe" Boros Charm which can still ding someone for 4 to the dome if necessary.

If you stick to monowhite, you should include at least some Pacifism in the sideboard for "psuedo-creature-removal"

Also you can't curve out very well due to not having any 2 drops. I would drop Elspeth, Sun's Champion or at least move her to the side vs control matchups. I'd drop a couple of lands even and go with some Precinct Captain s as they are great 2 drops

1: Spirit is a two drop. 2: This is for after the RTR rotates out. Means none of those suggestions will still be around except for chained... Which there is no point to splash just for chained.

Oh nevermind I didn't see the "post rotation" part of the comments sorry

All good man. :) thank you for the comments.

You're welcome :) I think you're going too far ahead. Rotation won't happen for another 8 months lol

Yes, but I do need to be read for when my entire deck rotatess out. And this is what I plan on doing. So it's keeping track of options for myself.